IMPORTANT: Replace all rem units to px

47 files changed, 388 insertions, 372 deletions

diff --git a/src/accordions.less b/src/accordions.less
index 45d40b9..df630ea 100644
--- a/src/accordions.less
+++ b/src/accordions.less
@@ -10,7 +10,7 @@
           }
         }
         & ~ .accordion-body {
-          max-height: 100rem;
+          max-height: 1000px;
           transition: max-height 3s ease;
         }
       }
@@ -18,7 +18,7 @@
 
     .accordion-header {
       display: block;
-      padding: 1rem;
+      padding: @layout-spacing;
 
       .icon {
         transition: all .25s ease;
@@ -26,7 +26,7 @@
     }
 
     .accordion-body {
-      margin-bottom: 1rem;
+      margin-bottom: @layout-spacing;
       max-height: 0;
       overflow: hidden;
       transition: max-height .3s ease;
diff --git a/src/animations.less b/src/animations.less
index 594c51d..f6b8724 100644
--- a/src/animations.less
+++ b/src/animations.less
@@ -11,7 +11,7 @@
 @keyframes slide-down {
   0% {
     opacity: 0;
-    transform: translateY(-3rem);
+    transform: translateY(-@unit-8);
   }
   100% {
     opacity: 1;
diff --git a/src/asian.less b/src/asian.less
index 38230e4..a68cb39 100644
--- a/src/asian.less
+++ b/src/asian.less
@@ -16,7 +16,7 @@
 .cjk {
   ins,
   u {
-    border-bottom: .1rem solid;
+    border-bottom: @border-width solid;
     text-decoration: none;
   }
 
diff --git a/src/autocomplete.less b/src/autocomplete.less
index 68b31fd..46af3b2 100644
--- a/src/autocomplete.less
+++ b/src/autocomplete.less
@@ -7,8 +7,8 @@
     display: flex;
     flex-wrap: wrap;
     height: auto;
-    min-height: 3.2rem;
-    padding: .1rem 0 0 .1rem;
+    min-height: @unit-8;
+    padding: @border-width 0 0 @border-width;
 
     &.is-focused {
       border-color: @primary-color;
@@ -20,8 +20,8 @@
       box-shadow: none;
       display: inline-block;
       flex: 1 0 auto;
-      height: 2.8rem;
-      line-height: 1.6rem;
+      height: @unit-7;
+      line-height: @unit-4;
       width: auto;
     }
   }
diff --git a/src/avatars.less b/src/avatars.less
index 9aa653c..b964146 100644
--- a/src/avatars.less
+++ b/src/avatars.less
@@ -1,37 +1,27 @@
 // Avatars
 .avatar {
+  .avatar-base();
   background: @primary-color;
   border-radius: 50%;
   color: fade(@light-color, 85%);
   display: inline-block;
-  font-size: @font-size;
   font-weight: 300;
-  height: 3.2rem;
   line-height: 1;
   margin: 0;
   position: relative;
   vertical-align: middle;
-  width: 3.2rem;
 
   &.avatar-xs {
-    font-size: .8rem;
-    height: 1.6rem;
-    width: 1.6rem;
+    .avatar-base(@unit-4);
   }
   &.avatar-sm {
-    font-size: 1rem;
-    height: 2.4rem;
-    width: 2.4rem;
+    .avatar-base(@unit-6);
   }
   &.avatar-lg {
-    font-size: 2rem;
-    height: 4.8rem;
-    width: 4.8rem;
+    .avatar-base(@unit-12);
   }
   &.avatar-xl {
-    font-size: 2.6rem;
-    height: 6.4rem;
-    width: 6.4rem;
+    .avatar-base(@unit-16);
   }
 
   img {
@@ -46,7 +36,7 @@
     background: @bg-color-light;
     bottom: 14.64%;
     height: 50%;
-    padding: .2rem;
+    padding: @border-width-lg;
     position: absolute;
     right: 14.64%;
     transform: translate(50%, 50%);
diff --git a/src/badges.less b/src/badges.less
index 677cc9b..8dd5a51 100644
--- a/src/badges.less
+++ b/src/badges.less
@@ -8,21 +8,21 @@
     &::after {
       background: @primary-color;
       background-clip: padding-box;
-      border-radius: 1rem;
-      box-shadow: 0 0 0 .2rem @bg-color-light;
+      border-radius: 10px;
+      box-shadow: 0 0 0 2px @bg-color-light;
       color: @light-color;
       content: attr(data-badge);
       display: inline-block;
-      transform: translate(-.2rem, -1rem);
+      transform: translate(-2px, -10px);
     }
   }
   &[data-badge] {
     &::after {
       font-size: @font-size-sm;
-      height: 1.8rem;
+      height: 18px;
       line-height: 1;
-      min-width: 1.8rem;
-      padding: .3rem .5rem;
+      min-width: 18px;
+      padding: 3px 5px;
       text-align: center;
       white-space: nowrap;
     }
@@ -30,10 +30,10 @@
   &:not([data-badge]),
   &[data-badge=''] {
     &::after {
-      height: .6rem;
-      min-width: .6rem;
+      height: 6px;
+      min-width: 6px;
       padding: 0;
-      width: .6rem;
+      width: 6px;
     }
   }
 
@@ -61,10 +61,10 @@
   &.avatar-xs {
     &::after {
       content: "";
-      height: .8rem;
-      min-width: .8rem;
+      height: @unit-2;
+      min-width: @unit-2;
       padding: 0;
-      width: .8rem;
+      width: @unit-2;
     }
   }
 }
diff --git a/src/bars.less b/src/bars.less
index e494a3e..96848d2 100644
--- a/src/bars.less
+++ b/src/bars.less
@@ -4,11 +4,11 @@
   border-radius: @border-radius;
   display: flex;
   flex-wrap: nowrap;
-  height: 1.6rem;
+  height: @unit-4;
   width: 100%;
 
   &.bar-sm {
-    height: .4rem;
+    height: @unit-1;
   }
 
   // TODO: attr() support
@@ -18,9 +18,8 @@
     display: block;
     font-size: @font-size-sm;
     flex-shrink: 0;
-    line-height: 1;
+    line-height: @unit-4;
     height: 100%;
-    padding: .2rem 0;
     position: relative;
     text-align: center;
     width: 0;
@@ -39,8 +38,8 @@
 
 // Slider bar
 .bar-slider {
-  height: .2rem;
-  margin: 1rem 0;
+  height: @border-width-lg;
+  margin: @layout-spacing 0;
   position: relative;
 
   .bar-item {
@@ -57,16 +56,16 @@
     background: @primary-color;
     border: 0;
     border-radius: 50%;
-    height: 1.2rem;
+    height: @unit-3;
     padding: 0;
     position: absolute;
     right: 0;
     top: 50%;
     transform: translate(50%, -50%);
-    width: 1.2rem;
+    width: @unit-3;
 
     &:active {
-      box-shadow: 0 0 0 .2rem @primary-color;
+      box-shadow: 0 0 0 2px @primary-color;
     }
   }
 }
diff --git a/src/breadcrumbs.less b/src/breadcrumbs.less
index 64e2316..280250b 100644
--- a/src/breadcrumbs.less
+++ b/src/breadcrumbs.less
@@ -1,15 +1,15 @@
 // Breadcrumbs
 .breadcrumb {
-  padding: .4rem 0;
+  padding: @unit-1 0;
 
   .breadcrumb-item {
     color: @gray-color-dark;
     display: inline-block;
     margin: 0;
-    padding: .2rem 0;
+    padding: @unit-1 0;
 
     &:not(:last-child) {
-      margin-right: .4rem;
+      margin-right: @unit-1;
 
       a {
         color: @gray-color-dark;
@@ -20,7 +20,7 @@
       &::before {
         color: @gray-color-light;
         content: "/";
-        padding-right: .4rem;
+        padding-right: @unit-1;
       }
     }
   }
diff --git a/src/buttons.less b/src/buttons.less
index f404e38..003ed91 100644
--- a/src/buttons.less
+++ b/src/buttons.less
@@ -9,10 +9,10 @@
   cursor: pointer;
   display: inline-block;
   font-size: @font-size;
-  height: 3.2rem;
-  line-height: 2rem;
+  height: @unit-8;
+  line-height: @line-height;
   outline: none;
-  padding: .5rem .8rem;
+  padding: 5px 8px;
   text-align: center;
   text-decoration: none;
   user-select: none;
@@ -90,14 +90,14 @@
   // Button Sizes
   &.btn-sm {
     font-size: @font-size-sm;
-    height: 2.4rem;
-    padding: .1rem .8rem;
+    height: @unit-6;
+    padding: 1px 8px;
   }
 
   &.btn-lg {
     font-size: @font-size-lg;
-    height: 4rem;
-    padding: .9rem .8rem;
+    height: @unit-10;
+    padding: 9px 8px;
   }
 
   // Button Block
@@ -108,16 +108,16 @@
 
   // Button Action
   &.btn-action {
-    width: 3.2rem;
+    width: @unit-8;
     padding-left: 0;
     padding-right: 0;
 
     &.btn-sm {
-      width: 2.4rem;
+      width: @unit-6;
     }
 
     &.btn-lg {
-      width: 4rem;
+      width: @unit-10;
     }
   }
 
@@ -126,14 +126,14 @@
     background: transparent;
     border: 0;
     color: currentColor;
-    height: 1.6rem;
-    line-height: 1.6rem;
-    margin-left: .4rem;
-    margin-right: -.2rem;
+    height: @unit-4;
+    line-height: @unit-4;
+    margin-left: @unit-1;
+    margin-right: -2px;
     opacity: .45;
-    padding: 0 .2rem;
+    padding: 0 2px;
     text-decoration: none;
-    width: 1.6rem;
+    width: @unit-4;
 
     &:hover {
       opacity: .85;
@@ -158,12 +158,12 @@
     }
     &:not(:first-child):not(:last-child) {
       border-radius: 0;
-      margin-left: -.1rem;
+      margin-left: -1px;
     }
     &:last-child:not(:first-child) {
       border-bottom-left-radius: 0;
       border-top-left-radius: 0;
-      margin-left: -.1rem;
+      margin-left: -1px;
     }
     &:focus,
     &:hover,
diff --git a/src/calendars.less b/src/calendars.less
index 621b9d1..44f88ae 100644
--- a/src/calendars.less
+++ b/src/calendars.less
@@ -3,7 +3,7 @@
   border: @border-width solid @border-color;
   border-radius: @border-radius;
   display: block;
-  min-width: 28rem;
+  min-width: 280px;
   text-align: center;
 
   .calendar-nav {
@@ -13,7 +13,7 @@
     border-top-right-radius: @border-radius;
     display: flex;
     font-size: @font-size-lg;
-    padding: 1rem;
+    padding: @layout-spacing;
   }
 
   .calendar-header,
@@ -21,7 +21,7 @@
     display: flex;
     flex-wrap: wrap;
     justify-content: center;
-    padding: 1rem 0;
+    padding: @layout-spacing 0;
 
     .calendar-date {
       flex: 0 0 14.28%; // 7 calendar-items each row
@@ -42,7 +42,7 @@
 
   .calendar-date {
     border: 0;
-    padding: .4rem;
+    padding: @unit-1;
 
     .date-item {
       appearance: none;
@@ -52,16 +52,16 @@
       color: @gray-color-dark;
       .control-transition();
       cursor: pointer;
-      height: 2.8rem;
-      line-height: 2rem;
+      height: @unit-7;
+      line-height: @unit-5;
       outline: none;
-      padding: .3rem;
+      padding: @unit-h;
       position: relative;
       text-align: center;
       text-decoration: none;
       vertical-align: middle;
       white-space: nowrap;
-      width: 2.8rem;
+      width: @unit-7;
 
       &.date-today {
         border-color: @secondary-color-dark;
@@ -90,8 +90,8 @@
       &.badge {
         &::after {
           position: absolute;
-          top: .3rem;
-          right: .3rem;
+          top: 3px;
+          right: 3px;
           transform: translate(50%, -50%);
         }
       }
@@ -113,7 +113,7 @@
     &::before {
       background: @secondary-color;
       content: "";
-      height: 2.8rem;
+      height: @unit-7;
       left: 0;
       position: absolute;
       right: 0;
@@ -145,7 +145,7 @@
         border-right: @border-width solid @border-color;
         display: flex;
         flex-direction: column;
-        height: 11rem;
+        height: 110px;
         padding: 0;
 
         &:nth-child(7n) {
@@ -159,24 +159,24 @@
 
     .date-item {
       align-self: flex-end;
-      height: 2.8rem;
-      margin-right: .5rem;
-      margin-top: .5rem;
+      height: @unit-7;
+      margin-right: @layout-spacing-sm;
+      margin-top: @layout-spacing-sm;
     }
 
     .calendar-range {
       &::before {
-        top: 1.9rem;
+        top: 19px;
       }
       &.range-start {
         &::before {
           left: auto;
-          width: 1.9rem;
+          width: 19px;
         }
       }
       &.range-end {
         &::before {
-          right: 1.9rem;
+          right: 19px;
         }
       }
     }
@@ -185,7 +185,7 @@
       flex-grow: 1;
       line-height: 1;
       overflow-y: auto;
-      padding: .5rem;
+      padding: @layout-spacing-sm;
     }
 
     .calendar-event {
@@ -194,9 +194,9 @@
       color: @primary-color;
       font-size: @font-size-sm;
       display: block;
-      margin: .2rem auto;
+      margin: @unit-h auto;
       overflow: hidden;
-      padding: .3rem .4rem;
+      padding: 3px 4px;
       text-align: left;
       text-overflow: ellipsis;
       vertical-align: baseline;
diff --git a/src/cards.less b/src/cards.less
index fb1c127..4a76df9 100644
--- a/src/cards.less
+++ b/src/cards.less
@@ -8,16 +8,16 @@
   .card-header,
   .card-body,
   .card-footer {
-    padding: @layout-padding-lg;
+    padding: @layout-spacing-lg;
     padding-bottom: 0;
 
     &:last-child {
-      padding-bottom: @layout-padding-lg;
+      padding-bottom: @layout-spacing-lg;
     }
   }
 
   .card-image {
-    padding-top: @layout-padding-lg;
+    padding-top: @layout-spacing-lg;
 
     &:first-child {
       padding-top: 0;
@@ -37,7 +37,7 @@
   }
 
   .card-title {
-    font-size: 2rem;
+    font-size: 20px;
   }
 
   .card-subtitle {
diff --git a/src/carousels.less b/src/carousels.less
index ee30edf..510560d 100644
--- a/src/carousels.less
+++ b/src/carousels.less
@@ -47,10 +47,10 @@
       z-index: @zindex-2;
     }
     .item-prev {
-      left: 2rem;
+      left: 20px;
     }
     .item-next {
-      right: 2rem;
+      right: 20px;
     }
   }
 
@@ -72,31 +72,31 @@
   }
 
   .carousel-nav {
-    bottom: 1rem;
+    bottom: @layout-spacing;
     display: flex;
     justify-content: center;
     left: 50%;
     position: absolute;
     transform: translateX(-50%);
-    width: 20rem;
+    width: 200px;
     z-index: @zindex-2;
 
     .nav-item {
       color: fade(@gray-color-light, 50%);
       display: block;
       flex: 1 0 auto;
-      height: 4rem;
-      margin: .4rem;
-      max-width: 5rem;
+      height: @unit-8;
+      margin: @unit-1;
+      max-width: 50px;
       position: relative;
 
       &::before {
         background: currentColor;
         content: "";
         display: block;
-        height: .3rem;
+        height: 2px;
         position: absolute;
-        top: 2rem;
+        top: 10px;
         width: 100%;
       }
     }
diff --git a/src/chips.less b/src/chips.less
index 2d45636..b9ebde5 100644
--- a/src/chips.less
+++ b/src/chips.less
@@ -5,10 +5,10 @@
   border-radius: @border-radius;
   color: @gray-color-dark;
   display: inline-flex;
-  height: 2.8rem;
-  margin: 0 .1rem .1rem 0;
+  height: @unit-7;
+  margin: 0 @unit-0 @unit-0 0;
   max-width: 100%;
-  padding: .1rem .8rem;
+  padding: @unit-0 @unit-2;
   text-decoration: none;
   vertical-align: middle;
 
@@ -18,7 +18,7 @@
   }
 
   .avatar {
-    margin-left: -.4rem;
-    margin-right: .4rem;
+    margin-left: -@unit-1;
+    margin-right: @unit-1;
   }
 }
diff --git a/src/codes.less b/src/codes.less
index bdb73ee..e08948b 100644
--- a/src/codes.less
+++ b/src/codes.less
@@ -7,7 +7,7 @@ code {
 .code {
   border-radius: @border-radius;
   color: @body-font-color;
-  line-height: 2rem;
+  line-height: @line-height;
   position: relative;
 
   &::before {
@@ -15,8 +15,8 @@ code {
     color: @gray-color;
     font-size: @font-size-sm;
     position: absolute;
-    right: 1rem;
-    top: .2rem;
+    right: @layout-spacing;
+    top: @unit-h;
   }
 
   code {
@@ -25,7 +25,7 @@ code {
     display: block;
     line-height: inherit;
     overflow-x: auto;
-    padding: 2rem;
+    padding: 20px;
     width: 100%;
   }
 }
diff --git a/src/comparison-sliders.less b/src/comparison-sliders.less
index 84a7a31..937c315 100644
--- a/src/comparison-sliders.less
+++ b/src/comparison-sliders.less
@@ -29,7 +29,7 @@
     width: 100%;
 
     .comparison-label {
-      right: 1.6rem;
+      right: @unit-4;
     }
   }
 
@@ -45,7 +45,7 @@
       height: 100%;
       left: 0;
       position: absolute;
-      right: 1.6rem;
+      right: @unit-4;
       top: 0;
       z-index: @zindex-0;
     }
@@ -53,30 +53,30 @@
     &::after {
       background: currentColor;
       border-radius: 50%;
-      box-shadow: 0 -.5rem, 0 .5rem;
+      box-shadow: 0 -5px, 0 5px;
       color: @light-color;
       content: "";
-      height: .3rem;
+      height: 3px;
       position: absolute;
-      right: .8rem;
+      right: @unit-2;
       top: 50%;
       transform: translate(50%, -50%);
-      width: .3rem;
+      width: 3px;
       z-index: -@zindex-0;
     }
 
     .comparison-label {
-      left: 1.6rem;
+      left: @unit-4;
     }
   }
 
   .comparison-resizer {
     animation: first-run 1.5s 1 ease-in-out;
     cursor: ew-resize;
-    height: 1.5rem;
+    height: 15px;
     left: 0;
     max-width: 100%;
-    min-width: 1.6rem;
+    min-width: @unit-4;
     opacity: 0;
     outline: none;
     position: relative;
@@ -88,9 +88,9 @@
 
   .comparison-label {
     background: fade(@dark-color, 50%);
-    bottom: 1.6rem;
+    bottom: @unit-4;
     color: @light-color;
-    padding: .3rem .8rem;
+    padding: @unit-1 @unit-2;
     position: absolute;
     user-select: none;
   }
@@ -101,13 +101,13 @@
     width: 0;
   }
   25% {
-    width: 4.8rem;
+    width: @unit-12;
   }
   50% {
-    width: 1.6rem;
+    width: @unit-4;
   }
   75% {
-    width: 2.4rem;
+    width: @unit-6;
   }
   100% {
     width: 0;
diff --git a/src/empty.less b/src/empty.less
index 07d62c5..acfc8a0 100644
--- a/src/empty.less
+++ b/src/empty.less
@@ -4,15 +4,15 @@
   border-radius: @border-radius;
   color: @gray-color-dark;
   text-align: center;
-  padding: 4 * @layout-padding;
+  padding: 4 * @layout-spacing;
 
   .empty-icon {
-    margin-bottom: 1.5rem;
+    margin-bottom: @layout-spacing-lg;
   }
 
   .empty-title,
   .empty-subtitle {
-    margin: 1rem auto;
+    margin: @layout-spacing auto;
   }
 
   .empty-subtitle {
@@ -20,6 +20,6 @@
   }
 
   .empty-action {
-    margin-top: 1.5rem;
+    margin-top: @layout-spacing-lg;
   }
 }
diff --git a/src/filters.less b/src/filters.less
index e9ecfaf..e417081 100644
--- a/src/filters.less
+++ b/src/filters.less
@@ -1,7 +1,7 @@
 // Filters
 .filter {
   .filter-nav {
-    margin: 1rem 0;
+    margin: @layout-spacing 0;
   }
 
   .filter-body {
diff --git a/src/forms.less b/src/forms.less
index 6583585..90201ec 100644
--- a/src/forms.less
+++ b/src/forms.less
@@ -1,21 +1,21 @@
 // Forms
 .form-group {
   &:not(:last-child) {
-    margin-bottom: @layout-padding;
+    margin-bottom: @layout-spacing;
   }
 }
 
 // Form element: Label
 .form-label {
   display: block;
-  padding: .6rem 0;
+  padding: 6px 0;
 
   &.label-sm {
-    padding: .2rem 0;
+    padding: 2px 0;
   }
 
   &.label-lg {
-    padding: 1rem 0;
+    padding: @layout-spacing 0;
   }
 }
 
@@ -30,11 +30,11 @@
   .control-transition();
   display: block;
   font-size: @font-size;
-  height: 3.2rem;
-  line-height: 2rem;
+  height: @unit-8;
+  line-height: @line-height;
   max-width: 100%;
   outline: none;
-  padding: .5rem .8rem;
+  padding: 5px 8px;
   position: relative;
   width: 100%;
   &:focus {
@@ -48,14 +48,14 @@
   // Input sizes
   &.input-sm {
     font-size: @font-size-sm;
-    height: 2.4rem;
-    padding: .1rem .8rem;
+    height: 24px;
+    padding: 1px 8px;
   }
 
   &.input-lg {
     font-size: @font-size-lg;
-    height: 4rem;
-    padding: .9rem .8rem;
+    height: 40px;
+    padding: 9px 8px;
   }
 
   &.input-inline {
@@ -78,7 +78,7 @@
 // Form element: Input hint
 .form-input-hint {
   color: @gray-color;
-  margin-top: .4rem;
+  margin-top: @unit-1;
 
   .has-success &,
   .is-success + & {
@@ -98,21 +98,21 @@
   border-radius: @border-radius;
   color: inherit;
   font-size: @font-size;
-  line-height: 2rem;
+  line-height: @line-height;
   outline: none;
-  padding: .5rem .8rem;
+  padding: 5px 8px;
   vertical-align: middle;
   width: 100%;
 
   &[multiple] {
     option {
-      padding: .2rem .4rem;
+      padding: 2px 4px;
     }
   }
   &:not([multiple]) {
-    background: @bg-color-light url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%23667189' d='M2 0L0 2h4zm0 5L0 3h4z'/%3E%3C/svg%3E") no-repeat right .75rem center / .8rem 1rem;
-    height: 3.2rem;
-    padding-right: 2.4rem;
+    background: @bg-color-light url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%23667189' d='M2 0L0 2h4zm0 5L0 3h4z'/%3E%3C/svg%3E") no-repeat right 7.5px center / 8px 10px;
+    height: 32px;
+    padding-right: 24px;
   }
   &:focus {
     border-color: @primary-color;
@@ -125,14 +125,14 @@
   // Select sizes
   &.select-sm {
     font-size: @font-size-sm;
-    height: 2.4rem;
-    padding: .1rem 2rem .1rem .6rem;
+    height: 24px;
+    padding: 1px 20px 1px 6px;
   }
 
   &.select-lg {
     font-size: @font-size-lg;
-    height: 4rem;
-    padding: .9rem 2.4rem .9rem .8rem;
+    height: 40px;
+    padding: 9px 24px 9px 8px;
   }
 }
 
@@ -178,8 +178,8 @@
   position: relative;
 
   .form-icon {
-    margin: 0 .8rem;
-    min-width: 1.4rem;
+    margin: 0 8px;
+    min-width: 14px;
     position: absolute;
     top: 50%;
     transform: translateY(-50%);
@@ -192,7 +192,7 @@
   }
 
   .form-input {
-    padding-left: 3rem;
+    padding-left: 30px;
   }
 }
 
@@ -202,7 +202,7 @@
   }
 
   .form-input {
-    padding-right: 3rem;
+    padding-right: 30px;
   }
 }
 
@@ -211,16 +211,16 @@
 .form-radio,
 .form-switch {
   display: inline-block;
-  line-height: 2rem;
+  line-height: @line-height;
   position: relative;
 
   input {
     clip: rect(0, 0, 0, 0);
-    height: .1rem;
-    margin: -.1rem;
+    height: 1px;
+    margin: -1px;
     overflow: hidden;
     position: absolute;
-    width: .1rem;
+    width: 1px;
     &:focus + .form-icon {
       border-color: @primary-color;
       .control-shadow();
@@ -242,14 +242,14 @@
 
 .form-checkbox,
 .form-radio {
-  padding: .2rem 2rem;
+  padding: 2px 20px;
 
   .form-icon {
     background: @bg-color-light;
-    height: 1.4rem;
+    height: 14px;
     left: 0;
-    top: .5rem;
-    width: 1.4rem;
+    top: 5px;
+    width: 14px;
   }
 
   input {
@@ -267,18 +267,18 @@
     &:checked + .form-icon {
       &::before {
         background-clip: padding-box;
-        border: .2rem solid @light-color;
+        border: @border-width-lg solid @light-color;
         border-left-width: 0;
         border-top-width: 0;
         content: "";
-        height: 1rem;
+        height: 10px;
         left: 50%;
-        margin-left: -.3rem;
-        margin-top: -.6rem;
+        margin-left: -3px;
+        margin-top: -6px;
         position: absolute;
         top: 50%;
         transform: rotate(45deg);
-        width: .6rem;
+        width: 6px;
       }
     }
     &:indeterminate + .form-icon {
@@ -287,20 +287,20 @@
       &::before {
         background: @bg-color-light;
         content: "";
-        height: .2rem;
+        height: 2px;
         left: 50%;
-        margin-left: -.5rem;
-        margin-top: -.1rem;
+        margin-left: -5px;
+        margin-top: -1px;
         position: absolute;
         top: 50%;
-        width: 1rem;
+        width: 10px;
       }
     }
   }
 }
 .form-radio {
   .form-icon {
-    border-radius: .7rem;
+    border-radius: 7px;
   }
 
   input {
@@ -309,13 +309,13 @@
         background: @bg-color-light;
         border-radius: @border-radius;
         content: "";
-        height: .4rem;
+        height: 4px;
         left: 50%;
-        margin-left: -.2rem;
-        margin-top: -.2rem;
+        margin-left: -2px;
+        margin-top: -2px;
         position: absolute;
         top: 50%;
-        width: .4rem;
+        width: 4px;
       }
     }
   }
@@ -323,34 +323,34 @@
 
 // Form element: Switch
 .form-switch {
-  padding: .2rem 2rem .2rem 3.6rem;
+  padding: 2px 20px 2px 36px;
 
   .form-icon {
     background: @gray-color-light;
     background-clip: padding-box;
-    border-radius: .9rem;
-    height: 1.8rem;
+    border-radius: 9px;
+    height: 18px;
     left: 0;
-    top: .3rem;
-    width: 3rem;
+    top: 3px;
+    width: 30px;
     &::before {
       background: @bg-color-light;
-      border-radius: .8rem;
+      border-radius: 8px;
       content: "";
       display: block;
-      height: 1.6rem;
+      height: 16px;
       left: 0;
       position: absolute;
       top: 0;
       .control-transition();
-      width: 1.6rem;
+      width: 16px;
     }
   }
 
   input {
     &:checked + .form-icon {
       &::before {
-        left: 1.2rem;
+        left: 12px;
       }
     }
     &:active + .form-icon {
@@ -369,16 +369,16 @@
     background: @bg-color;
     border: @border-width solid @border-color-dark;
     border-radius: @border-radius;
-    line-height: 2rem;
-    padding: .5rem .8rem;
+    line-height: @line-height;
+    padding: 5px 8px;
 
     &.addon-sm {
       font-size: @font-size-sm;
-      padding: .1rem .8rem;
+      padding: 1px 8px;
     }
     &.addon-lg {
       font-size: @font-size-lg;
-      padding: .9rem .8rem;
+      padding: 9px 8px;
     }
   }
   .input-group-addon,
@@ -396,12 +396,12 @@
     }
     &:not(:first-child):not(:last-child) {
       border-radius: 0;
-      margin-left: -.1rem;
+      margin-left: -1px;
     }
     &:last-child:not(:first-child) {
       border-bottom-left-radius: 0;
       border-top-left-radius: 0;
-      margin-left: -.1rem;
+      margin-left: -1px;
     }
     &:focus {
       z-index: @zindex-0;
@@ -458,7 +458,7 @@ input {
 
 // Form Horizontal
 .form-horizontal {
-  padding: @layout-padding;
+  padding: @layout-spacing;
 
   .form-group {
     display: flex;
@@ -467,6 +467,6 @@ input {
   .form-checkbox,
   .form-radio,
   .form-switch {
-    margin: .4rem 0;
+    margin: @unit-4 0;
   }
 }
diff --git a/src/icons.less b/src/icons.less
index b59ecca..ca7672d 100644
--- a/src/icons.less
+++ b/src/icons.less
@@ -1,5 +1,5 @@
 // CSS Icons
-@icon-border-width: .2rem;
+@icon-border-width: @border-width-lg;
 
 .icon {
   box-sizing: border-box;
@@ -8,7 +8,7 @@
   font-style: normal;
   height: 1em;
   position: relative;
-  text-indent: -999rem;
+  text-indent: -9999px;
   vertical-align: middle;
   width: 1em;
   &::before,
@@ -150,8 +150,8 @@
     background: currentColor;
     box-shadow: -.35em -.35em, -.35em 0, -.35em .35em, 0 -.35em, 0 .35em, .35em -.35em, .35em 0, .35em .35em;
     content: "";
-    height: .3rem;
-    width: .3rem;
+    height: 3px;
+    width: 3px;
   }
 }
 
@@ -192,8 +192,8 @@
     box-shadow: -.4em 0, .4em 0;
     border-radius: 50%;
     content: "";
-    height: .3rem;
-    width: .3rem;
+    height: 3px;
+    width: 3px;
   }
 }
 .icon-more-vert {
diff --git a/src/layout.less b/src/layout.less
index 1c657df..0f7bdfe 100644
--- a/src/layout.less
+++ b/src/layout.less
@@ -2,21 +2,21 @@
 .container {
   margin-left: auto;
   margin-right: auto;
-  padding-left: @layout-padding;
-  padding-right: @layout-padding;
+  padding-left: @layout-spacing;
+  padding-right: @layout-spacing;
   width: 100%;
   &:extend(.clearfix all);
 
   &.grid-1280 {
-    max-width: 128rem + 2 * @layout-padding;
+    max-width: @size-xl + 2 * @layout-spacing;
   }
 
   &.grid-960 {
-    max-width: 96rem + 2 * @layout-padding;
+    max-width: @size-lg + 2 * @layout-spacing;
   }
 
   &.grid-480 {
-    max-width: 48rem + 2 * @layout-padding;
+    max-width: @size-xs + 2 * @layout-spacing;
   }
 }
 
@@ -24,8 +24,8 @@
 .columns {
   display: flex;
   flex-wrap: wrap;
-  margin-left: -@layout-padding;
-  margin-right: -@layout-padding;
+  margin-left: -@layout-spacing;
+  margin-right: -@layout-spacing;
 
   &.col-gapless {
     margin-left: 0;
@@ -44,7 +44,7 @@
 .column {
   flex: 1;
   max-width: 100%;
-  padding: @layout-padding;
+  padding: @layout-spacing;
 
   &.col-12,
   &.col-11,
diff --git a/src/media.less b/src/media.less
index fcd22e0..455d77c 100644
--- a/src/media.less
+++ b/src/media.less
@@ -60,10 +60,10 @@
 }
 
 .figure {
-  margin: 0 0 @layout-padding 0;
+  margin: 0 0 @layout-spacing 0;
 
   .figure-caption {
     color: @gray-color-dark;
-    margin-top: @layout-padding;
+    margin-top: @layout-spacing;
   }
 }
diff --git a/src/menus.less b/src/menus.less
index ebd7400..06de453 100644
--- a/src/menus.less
+++ b/src/menus.less
@@ -5,9 +5,9 @@
   list-style: none;
   margin: 0;
   min-width: @control-min-width;
-  padding: 1rem;
-  .shadow-variant(.1rem);
-  transform: translateY(.5rem);
+  padding: @layout-spacing;
+  .shadow-variant(1px);
+  transform: translateY(@layout-spacing-sm);
   z-index: @zindex-1;
 
   &.menu-nav {
@@ -16,7 +16,7 @@
 
   .menu-item {
     margin-top: 0;
-    padding: 0 .8rem;
+    padding: 0 @unit-2;
     text-decoration: none;
     user-select: none;
 
@@ -24,8 +24,8 @@
       border-radius: @border-radius;
       color: inherit;
       display: block;
-      margin: 0 -.8rem;
-      padding: .6rem .8rem;
+      margin: 0 -@unit-2;
+      padding: 6px 8px;
       text-decoration: none;
       &:focus,
       &:hover {
@@ -41,10 +41,10 @@
 
   .menu-badge {
     float: right;
-    padding: .6rem 0;
+    padding: 6px 0;
 
     .btn {
-      margin-top: -.2rem;
+      margin-top: -2px;
     }
   }
 }
diff --git a/src/meters.less b/src/meters.less
index bf4d0b9..b7a6190 100644
--- a/src/meters.less
+++ b/src/meters.less
@@ -7,7 +7,7 @@
   border-radius: @border-radius;
   display: block;
   width: 100%;
-  height: 1.6rem;
+  height: @unit-4;
 
   &::-webkit-meter-inner-element {
     display: block;
diff --git a/src/mixins.less b/src/mixins.less
index b161e0d..5e5ddda 100644
--- a/src/mixins.less
+++ b/src/mixins.less
@@ -1,4 +1,11 @@
 // Mixins
+// Avatar mixin
+.avatar-base(@size: @unit-8) {
+  font-size: @size / 2.2;
+  height: @size;
+  width: @size;
+}
+
 // Clearfix mixin
 .clearfix() {
   &::after {
@@ -10,7 +17,7 @@
 
 // Component focus shadow
 .control-shadow(@color: @dark-color) {
-  box-shadow: 0 0 0 .2rem fade(@color, 10%);
+  box-shadow: 0 0 0 2px fade(@color, 10%);
 }
 
 // Component transition
@@ -29,7 +36,7 @@
   border-radius: @border-radius;
   display: inline-block;
   line-height: 1;
-  padding: .3rem .4rem;
+  padding: 3px 4px;
   vertical-align: baseline;
 }
 
@@ -40,7 +47,7 @@
 
 // Shadow mixin
 .shadow-variant(@offset) {
-  box-shadow: 0 @offset (@offset+.1rem)*2 fade(@dark-color, 30%);
+  box-shadow: 0 @offset (@offset+1px)*2 fade(@dark-color, 30%);
 }
 
 // Colors mixin
diff --git a/src/modals.less b/src/modals.less
index 4353a54..60aa2b1 100644
--- a/src/modals.less
+++ b/src/modals.less
@@ -7,7 +7,7 @@
   left: 0;
   opacity: 0;
   overflow: hidden;
-  padding: @layout-padding;
+  padding: @layout-spacing;
   position: fixed;
   right: 0;
   top: 0;
@@ -31,14 +31,14 @@
 
     .modal-container {
       animation: slide-down .2s ease 1;
-      max-width: 64rem;
+      max-width: 640px;
       z-index: @zindex-0;
     }
   }
 
   &.modal-sm {
     .modal-container {
-      max-width: 32rem;
+      max-width: @control-max-width;
     }
   }
 }
@@ -48,11 +48,11 @@
   border-radius: @border-radius;
   display: block;
   padding: 0;
-  .shadow-variant(.4rem);
+  .shadow-variant(4px);
   text-align: left;
 
   .modal-header {
-    padding: @layout-padding-lg;
+    padding: @layout-spacing-lg;
 
     .modal-title {
       font-size: @font-size-lg;
@@ -63,12 +63,12 @@
   .modal-body {
     max-height: 50vh;
     overflow-y: auto;
-    padding: @layout-padding-lg;
+    padding: @layout-spacing-lg;
     position: relative;
   }
 
   .modal-footer {
-    padding: @layout-padding-lg;
+    padding: @layout-spacing-lg;
     text-align: right;
   }
 }
diff --git a/src/navigation.less b/src/navigation.less
index 08404b1..a129886 100644
--- a/src/navigation.less
+++ b/src/navigation.less
@@ -4,7 +4,7 @@
 .pagination,
 .nav {
   list-style: none;
-  margin: .5rem 0;
+  margin: @unit-1 0;
 }
 
 @import 'breadcrumbs.less';
diff --git a/src/navs.less b/src/navs.less
index 7276e22..edfc3d3 100644
--- a/src/navs.less
+++ b/src/navs.less
@@ -6,7 +6,7 @@
   .nav-item {
     a {
       color: @gray-color-dark;
-      padding: .6rem .8rem;
+      padding: @unit-1 @unit-2;
       text-decoration: none;
       &:focus,
       &:hover {
@@ -26,7 +26,7 @@
   }
 
   & .nav {
-    margin-bottom: 1rem;
-    margin-left: 2rem;
+    margin-bottom: @unit-2;
+    margin-left: @unit-4;
   }
 }
diff --git a/src/pagination.less b/src/pagination.less
index 3d74037..e79f873 100644
--- a/src/pagination.less
+++ b/src/pagination.less
@@ -3,18 +3,18 @@
   display: flex;
 
   .page-item {
-    margin: 1rem .1rem;
+    margin: 10px 1px;
 
     span {
       display: inline-block;
-      padding: .6rem .4rem;
+      padding: 6px 4px;
     }
 
     a {
       border-radius: @border-radius;
       color: @gray-color-dark;
       display: inline-block;
-      padding: .6rem .8rem;
+      padding: 6px 8px;
       text-decoration: none;
       &:focus,
       &:hover {
diff --git a/src/panels.less b/src/panels.less
index e361e25..09495de 100644
--- a/src/panels.less
+++ b/src/panels.less
@@ -8,7 +8,7 @@
   .panel-header,
   .panel-footer {
     flex: 0 0 auto;
-    padding: @layout-padding-lg;
+    padding: @layout-spacing-lg;
   }
 
   .panel-nav {
@@ -18,11 +18,11 @@
   .panel-body {
     flex: 1 1 auto;
     overflow-y: auto;
-    padding: 0 @layout-padding-lg;
+    padding: 0 @layout-spacing-lg;
   }
 
   .panel-title {
-    font-size: 2rem;
+    font-size: @font-size-lg;
   }
 
   .panel-subtitle {
diff --git a/src/parallax.less b/src/parallax.less
index 9886206..beca542 100644
--- a/src/parallax.less
+++ b/src/parallax.less
@@ -1,8 +1,8 @@
 // Parallax
 @parallax-deg: 3deg;
-@parallax-offset: .65rem;
-@parallax-offset-z: 10rem;
-@parallax-perspective: 100rem;
+@parallax-offset: 6.5px;
+@parallax-offset-z: 100px;
+@parallax-perspective: 1000px;
 @parallax-scale: 1 - unit(@parallax-offset-z / @parallax-perspective);
 
 .parallax {
@@ -13,7 +13,7 @@
 
   .parallax-content {
     height: auto;
-    .shadow-variant(2rem);
+    .shadow-variant(20px);
     transform: perspective(@parallax-perspective);
     transform-style: preserve-3d;
     transition: all .4s ease;
@@ -39,7 +39,7 @@
     left: 0;
     position: absolute;
     text-align: center;
-    text-shadow: 0 0 3rem fade(@dark-color, 95%);
+    text-shadow: 0 0 4px fade(@dark-color, 95%);
     top: 0;
     transform: translateZ(@parallax-offset-z) scale(@parallax-scale);
     transition: all .4s ease;
diff --git a/src/popovers.less b/src/popovers.less
index a7b90f4..4683a67 100644
--- a/src/popovers.less
+++ b/src/popovers.less
@@ -7,12 +7,12 @@
     content: attr(data-tooltip);
     opacity: 0;
     left: 50%;
-    padding: @layout-padding;
+    padding: @layout-spacing;
     position: absolute;
     top: 0;
     transform: translate(-50%, -50%) scale(0);
     transition: transform .2s ease;
-    width: 32rem;
+    width: @control-max-width;
     z-index: @zindex-4;
   }
 
@@ -65,6 +65,6 @@
 
   .card {
     border: 0;
-    .shadow-variant(.4rem);
+    .shadow-variant(4px);
   }
 }
diff --git a/src/progress.less b/src/progress.less
index 9fca956..cf9e34b 100644
--- a/src/progress.less
+++ b/src/progress.less
@@ -6,7 +6,7 @@
   border: 0;
   border-radius: @border-radius;
   color: @primary-color;
-  height: .4rem;
+  height: @unit-1;
   position: relative;
   width: 100%;
 
diff --git a/src/sliders.less b/src/sliders.less
index 779117d..c90c334 100644
--- a/src/sliders.less
+++ b/src/sliders.less
@@ -5,7 +5,7 @@
   background: transparent;
   display: block;
   width: 100%;
-  height: 2.4rem;
+  height: @unit-6;
 
   &:focus {
     .control-shadow();
@@ -18,26 +18,26 @@
     background: @primary-color;
     border: 0;
     border-radius: 50%;
-    height: 1.2rem;
-    margin-top: -.5rem;
+    height: @unit-3;
+    margin-top: -5px;
     transition: transform .2s ease;
-    width: 1.2rem;
+    width: @unit-3;
   }
   &::-moz-range-thumb {
     background: @primary-color;
     border: 0;
     border-radius: 50%;
-    height: 1.2rem;
+    height: @unit-3;
     transition: transform .2s ease;
-    width: 1.2rem;
+    width: @unit-3;
   }
   &::-ms-thumb {
     background: @primary-color;
     border: 0;
     border-radius: 50%;
-    height: 1.2rem;
+    height: @unit-3;
     transition: transform .2s ease;
-    width: 1.2rem;
+    width: @unit-3;
   }
 
   &:active {
@@ -72,19 +72,19 @@
   &::-webkit-slider-runnable-track {
     background: @bg-color-dark;
     border-radius: @border-radius;
-    height: .2rem;
+    height: @unit-h;
     width: 100%;
   }
   &::-moz-range-track {
     background: @bg-color-dark;
     border-radius: @border-radius;
-    height: .2rem;
+    height: @unit-h;
     width: 100%;
   }
   &::-ms-track {
     background: @bg-color-dark;
     border-radius: @border-radius;
-    height: .2rem;
+    height: @unit-h;
     width: 100%;
   }
   &::-ms-fill-lower {
diff --git a/src/steps.less b/src/steps.less
index 800fdc0..fa0167f 100644
--- a/src/steps.less
+++ b/src/steps.less
@@ -3,44 +3,44 @@
   display: flex;
   flex-wrap: nowrap;
   list-style: none;
-  margin: .5rem 0;
+  margin: @unit-1 0;
   width: 100%;
 
   .step-item {
     flex: 1 1 0;
     margin-top: 0;
-    min-height: 2rem;
+    min-height: 20px;
     text-align: center;
     position: relative;
 
     &:not(:first-child)::before {
       background: @primary-color;
       content: "";
-      height: .2rem;
+      height: 2px;
       left: -50%;
       position: absolute;
-      top: .9rem;
+      top: 9px;
       width: 100%;
     }
 
     a {
       color: @gray-color;
       display: inline-block;
-      padding: 2rem 1rem 0;
+      padding: 20px 10px 0;
       text-decoration: none;
 
       &::before {
         background: @primary-color;
-        border: .2rem solid @light-color;
+        border: @border-width-lg solid @light-color;
         border-radius: 50%;
         content: "";
         display: block;
-        height: 1.2rem;
+        height: @unit-3;
         left: 50%;
         position: absolute;
-        top: .4rem;
+        top: @unit-1;
         transform: translateX(-50%);
-        width: 1.2rem;
+        width: @unit-3;
         z-index: @zindex-0;
       }
     }
@@ -49,7 +49,7 @@
       a {
         &::before {
           background: @light-color;
-          border: .2rem solid @primary-color;
+          border: @border-width-lg solid @primary-color;
         }
       }
 
diff --git a/src/tables.less b/src/tables.less
index 61f36e8..bbe47e2 100644
--- a/src/tables.less
+++ b/src/tables.less
@@ -37,7 +37,7 @@
   td,
   th {
     border-bottom: @border-width solid @border-color;
-    padding: 1.5rem 1rem;
+    padding: @unit-3 @unit-2;
   }
 
   th {
diff --git a/src/tabs.less b/src/tabs.less
index 781c2f2..1abfe75 100644
--- a/src/tabs.less
+++ b/src/tabs.less
@@ -13,11 +13,11 @@
     }
 
     a {
-      border-bottom: .2rem solid transparent;
+      border-bottom: @border-width-lg solid transparent;
       color: inherit;
       display: block;
       margin-top: 0;
-      padding: .6rem 1.2rem .4rem 1.2rem;
+      padding: 6px 12px 4px 12px;
       text-decoration: none;
       &:focus,
       &:hover {
@@ -39,8 +39,8 @@
       .badge {
         &[data-badge]::after {
           position: absolute;
-          right: -.4rem;
-          top: -.4rem;
+          right: -4px;
+          top: -4px;
           transform: translate(0, 0);
         }
       }
@@ -49,7 +49,7 @@
 
   &:not(.tab-block) {
     .badge {
-      padding-right: .2rem;
+      padding-right: 2px;
     }
   }
 }
diff --git a/src/tiles.less b/src/tiles.less
index 1214064..79c1a69 100644
--- a/src/tiles.less
+++ b/src/tiles.less
@@ -11,18 +11,18 @@
   .tile-content {
     flex: 1 1 auto;
     &:not(:first-child) {
-      padding-left: 1rem;
+      padding-left: @unit-2;
     }
     &:not(:last-child) {
-      padding-right: 1rem;
+      padding-right: @unit-2;
     }
   }
   .tile-title {
-    line-height: 2rem;
+    line-height: @line-height;
   }
   .tile-subtitle {
     color: lighten(@body-font-color, 40%);
-    line-height: 2rem;
+    line-height: @line-height;
   }
 
   &.tile-centered {
diff --git a/src/timelines.less b/src/timelines.less
index 277d10c..02b421e 100644
--- a/src/timelines.less
+++ b/src/timelines.less
@@ -2,16 +2,16 @@
 .timeline {
   .timeline-item {
     display: flex;
-    margin-bottom: 2.4rem;
+    margin-bottom: @unit-6;
     position: relative;
     &::before {
       background: @border-color;
       content: "";
       height: 100%;
-      left: 1.1rem;
+      left: 11px;
       position: absolute;
-      top: 2.4rem;
-      width: .2rem;
+      top: @unit-6;
+      width: 2px;
     }
 
     .timeline-left {
@@ -20,32 +20,32 @@
 
     .timeline-content {
       flex: 1 1 auto;
-      padding: .2rem 0 .2rem @layout-padding-lg;
+      padding: 2px 0 2px @layout-spacing-lg;
     }
 
     .timeline-icon {
       border-radius: 50%;
       color: @light-color;
       display: block;
-      height: 2.4rem;
+      height: @unit-6;
       text-align: center;
-      width: 2.4rem;
+      width: @unit-6;
       &::before {
-        border: .2rem solid @primary-color;
+        border: @border-width-lg solid @primary-color;
         border-radius: 50%;
         content: "";
         display: block;
-        height: .8rem;
-        left: .8rem;
+        height: @unit-2;
+        left: @unit-2;
         position: absolute;
-        top: .8rem;
-        width: .8rem;
+        top: @unit-2;
+        width: @unit-2;
       }
 
       &.icon-lg {
         background: @primary-color;
-        font-size: 1.6rem;
-        line-height: 2rem;
+        font-size: @font-size-lg;
+        line-height: @line-height;
         &::before {
           content: none;
         }
diff --git a/src/toasts.less b/src/toasts.less
index 8fe8388..5ec0ef8 100644
--- a/src/toasts.less
+++ b/src/toasts.less
@@ -4,7 +4,7 @@
   border-radius: @border-radius;
   color: @light-color;
   display: block;
-  padding: @layout-padding;
+  padding: @layout-spacing;
   .toast-variant(@dark-color);
   width: 100%;
 
@@ -36,6 +36,6 @@
   }
 
   .btn-clear {
-    margin: .2rem -.2rem .2rem .4rem;
+    margin: 2px -2px 2px 4px;
   }
 }
diff --git a/src/tooltips.less b/src/tooltips.less
index 25e7bf6..9afeb4d 100644
--- a/src/tooltips.less
+++ b/src/tooltips.less
@@ -10,14 +10,14 @@
     display: block;
     font-size: @font-size-sm;
     left: 50%;
-    max-width: 32rem;
+    max-width: @control-max-width;
     opacity: 0;
     overflow: hidden;
-    padding: .4rem .8rem;
+    padding: @unit-1 @unit-2;
     pointer-events: none;
     position: absolute;
     text-overflow: ellipsis;
-    transform: translate(-50%, 1rem);
+    transform: translate(-50%, @unit-2);
     transition: all .2s ease;
     white-space: nowrap;
     z-index: @zindex-2;
@@ -26,7 +26,7 @@
   &:hover {
     &::after {
       opacity: 1;
-      transform: translate(-50%, -.5rem);
+      transform: translate(-50%, -@unit-1);
     }
   }
   &[disabled],
@@ -38,12 +38,12 @@
     &::after {
       bottom: 50%;
       left: 100%;
-      transform: translate(-1rem, 50%);
+      transform: translate(-@unit-1, 50%);
     }
     &:focus,
     &:hover {
       &::after {
-        transform: translate(.5rem, 50%);
+        transform: translate(@unit-1, 50%);
       }
     }
   }
@@ -51,12 +51,12 @@
     &::after {
       bottom: auto;
       top: 100%;
-      transform: translate(-50%, -1rem);
+      transform: translate(-50%, -@unit-2);
     }
     &:focus,
     &:hover {
       &::after {
-        transform: translate(-50%, .5rem);
+        transform: translate(-50%, @unit-1);
       }
     }
   }
@@ -65,12 +65,12 @@
       bottom: 50%;
       left: auto;
       right: 100%;
-      transform: translate(1rem, 50%);
+      transform: translate(@unit-2, 50%);
     }
     &:focus,
     &:hover {
       &::after {
-        transform: translate(-.5rem, 50%);
+        transform: translate(-@unit-1, 50%);
       }
     }
   }
diff --git a/src/typography.less b/src/typography.less
index 567eec0..ad5ee84 100644
--- a/src/typography.less
+++ b/src/typography.less
@@ -9,32 +9,32 @@ h6 {
   color: inherit;
   font-weight: 500;
   line-height: 1.2;
-  margin-bottom: 1.5rem;
+  margin-bottom: @unit-4;
   margin-top: 0;
 }
 h1 {
-  font-size: 5rem;
+  font-size: 50px;
 }
 h2 {
-  font-size: 4rem;
+  font-size: 40px;
 }
 h3 {
-  font-size: 3rem;
+  font-size: 30px;
 }
 h4 {
-  font-size: 2.4rem;
+  font-size: 24px;
 }
 h5 {
-  font-size: 2rem;
+  font-size: 20px;
 }
 h6 {
-  font-size: 1.6rem;
+  font-size: 16px;
 }
 
 // Paragraphs
 p {
-  line-height: 2.4rem;
-  margin: 0 0 1rem;
+  line-height: 1.2 * @line-height;
+  margin: 0 0 @unit-3;
 }
 
 // Semantic text elements
@@ -45,7 +45,7 @@ u {
 }
 
 abbr[title] {
-  border-bottom: .1rem dotted;
+  border-bottom: @border-width dotted;
   cursor: help;
   text-decoration: none;
 }
@@ -62,9 +62,9 @@ mark {
 
 // Blockquote
 blockquote {
-  border-left: .2rem solid @border-color;
+  border-left: @border-width-lg solid @border-color;
   margin-left: 0;
-  padding: 1rem 2rem;
+  padding: @unit-2 @unit-4;
 
   p:last-child {
     margin-bottom: 0;
@@ -78,16 +78,16 @@ blockquote {
 // Lists
 ul,
 ol {
-  margin: 2rem 0 2rem 2rem;
+  margin: @unit-4 0 @unit-4 @unit-4;
   padding: 0;
 
   ul,
   ol {
-    margin: 1.5rem 0 1.5rem 2rem;
+    margin: @unit-4 0 @unit-4 @unit-4;
   }
 
   li {
-    margin-top: 1rem;
+    margin-top: @unit-2;
   }
 }
 
@@ -112,6 +112,6 @@ dl {
     font-weight: bold;
   }
   dd {
-    margin: .5rem 0 1.5rem 0;
+    margin: @unit-2 0 @unit-4 0;
   }
 }
diff --git a/src/utilities/display.less b/src/utilities/display.less
index f6a54b5..a00aa4a 100644
--- a/src/utilities/display.less
+++ b/src/utilities/display.less
@@ -34,12 +34,12 @@
 .text-assistive {
   border: 0;
   clip: rect(0,0,0,0);
-  height: .1rem;
-  margin: -.1rem;
+  height: 1px;
+  margin: -1px;
   overflow: hidden;
   padding: 0;
   position: absolute;
-  width: .1rem;
+  width: 1px;
 }
 .hand {
   cursor: pointer;
diff --git a/src/utilities/divider.less b/src/utilities/divider.less
index fe30f68..f59d0ea 100644
--- a/src/utilities/divider.less
+++ b/src/utilities/divider.less
@@ -10,35 +10,35 @@
     content: attr(data-content);
     display: inline-block;
     font-size: @font-size-sm;
-    padding: 0 .8rem;
-    transform: translateY(-1.1rem);
+    padding: 0 @unit-2;
+    transform: translateY(-@font-size-sm + @border-width);
   }
 }
 
 .divider {
   border-top: @border-width solid @border-color;
-  height: .1rem;
-  margin: 1rem 0;
+  height: @border-width;
+  margin: @layout-spacing 0;
 }
 
 .divider-vert {
   display: block;
-  padding: @layout-padding;
+  padding: @layout-spacing;
 
   &::before {
     border-left: @border-width solid @border-color;
-    bottom: @layout-padding;
+    bottom: @layout-spacing;
     content: "";
     display: block;
     left: 50%;
     position: absolute;
-    top: @layout-padding;
+    top: @layout-spacing;
     transform: translateX(-50%);
   }
 
   &[data-content]::after {
     left: 50%;
-    padding: .4rem 0;
+    padding: @unit-1 0;
     position: absolute;
     top: 50%;
     transform: translate(-50%, -50%);
diff --git a/src/utilities/loading.less b/src/utilities/loading.less
index 6f8b6e5..8b5c784 100644
--- a/src/utilities/loading.less
+++ b/src/utilities/loading.less
@@ -1,24 +1,24 @@
 // Loading
 .loading {
   color: transparent !important;
-  min-height: 1.6rem;
+  min-height: @unit-4;
   pointer-events: none;
   position: relative;
   &::after {
     animation: loading 500ms infinite linear;
-    border: .2rem solid @primary-color;
-    border-radius: .8rem;
+    border: @border-width-lg solid @primary-color;
+    border-radius: @unit-2;
     border-right-color: transparent;
     border-top-color: transparent;
     content: "";
     display: block;
-    height: 1.6rem;
+    height: @unit-4;
     left: 50%;
-    margin-left: -.8rem;
-    margin-top: -.8rem;
+    margin-left: -@unit-2;
+    margin-top: -@unit-2;
     position: absolute;
     top: 50%;
-    width: 1.6rem;
+    width: @unit-4;
     z-index: @zindex-0;
   }
 }
diff --git a/src/utilities/position.less b/src/utilities/position.less
index c71af85..71957d5 100644
--- a/src/utilities/position.less
+++ b/src/utilities/position.less
@@ -27,64 +27,64 @@
 
 // Spacing
 .mt-10 {
-  margin-top: 1rem;
+  margin-top: 10px;
 }
 .mr-10 {
-  margin-right: 1rem;
+  margin-right: 10px;
 }
 .mb-10 {
-  margin-bottom: 1rem;
+  margin-bottom: 10px;
 }
 .ml-10 {
-  margin-left: 1rem;
+  margin-left: 10px;
 }
 .m-10 {
-  margin: 1rem;
+  margin: 10px;
 }
 .mt-5 {
-  margin-top: .5rem;
+  margin-top: 5px;
 }
 .mr-5 {
-  margin-right: .5rem;
+  margin-right: 5px;
 }
 .mb-5 {
-  margin-bottom: .5rem;
+  margin-bottom: 5px;
 }
 .ml-5 {
-  margin-left: .5rem;
+  margin-left: 5px;
 }
 .m-5 {
-  margin: .5rem;
+  margin: 5px;
 }
 
 .pt-10 {
-  padding-top: 1rem;
+  padding-top: 10px;
 }
 .pr-10 {
-  padding-right: 1rem;
+  padding-right: 10px;
 }
 .pb-10 {
-  padding-bottom: 1rem;
+  padding-bottom: 10px;
 }
 .pl-10 {
-  padding-left: 1rem;
+  padding-left: 10px;
 }
 .p-10 {
-  padding: 1rem;
+  padding: 10px;
 }
 .pt-5 {
-  padding-top: .5rem;
+  padding-top: 5px;
 }
 .pr-5 {
-  padding-right: .5rem;
+  padding-right: 5px;
 }
 .pb-5 {
-  padding-bottom: .5rem;
+  padding-bottom: 5px;
 }
 .pl-5 {
-  padding-left: .5rem;
+  padding-left: 5px;
 }
 .p-5 {
-  padding: .5rem;
+  padding: 5px;
 }
 
diff --git a/src/utilities/shadow.less b/src/utilities/shadow.less
index 9d8ff2a..33086ad 100644
--- a/src/utilities/shadow.less
+++ b/src/utilities/shadow.less
@@ -3,14 +3,14 @@
   .shadow-variant(0);
 }
 .shadow-1 {
-  .shadow-variant(.1rem);
+  .shadow-variant(1px);
 }
 .shadow-2 {
-  .shadow-variant(.2rem);
+  .shadow-variant(2px);
 }
 .shadow-3 {
-  .shadow-variant(.3rem);
+  .shadow-variant(3px);
 }
 .shadow-4 {
-  .shadow-variant(.4rem);
+  .shadow-variant(4px);
 }
diff --git a/src/variables.less b/src/variables.less
index 0b7ba53..42eec35 100644
--- a/src/variables.less
+++ b/src/variables.less
@@ -5,9 +5,10 @@
 @html-line-height: 1.428571429;
 @body-bg: @bg-color-light;
 @body-font-color: @dark-color;
-@font-size: 1.4rem;
-@font-size-sm: 1.2rem;
-@font-size-lg: 1.6rem;
+@font-size: 14px;
+@font-size-sm: 12px;
+@font-size-lg: 16px;
+@line-height: 20px;
 
 // Fonts
 // Credit: https://www.smashingmagazine.com/2015/11/using-system-ui-fonts-practical-guide/
@@ -18,12 +19,31 @@
 @cjk-ko-font-family: @base-font-family, "Malgun Gothic", @fallback-font-family;
 @body-font-family: @base-font-family, @fallback-font-family;
 
+// Unit sizes
+@unit-0: 1px;
+@unit-h: 2px;
+@unit-1: 4px;
+@unit-2: 8px;
+@unit-3: 12px;
+@unit-4: 16px;
+@unit-5: 20px;
+@unit-6: 24px;
+@unit-7: 28px;
+@unit-8: 32px;
+@unit-9: 36px;
+@unit-10: 40px;
+@unit-12: 48px;
+@unit-16: 64px;
+
 // Sizes
-@layout-padding: 1rem;
-@layout-padding-lg: 1.5rem;
-@control-min-width: 18rem;
-@border-radius: .2rem;
-@border-width: .1rem;
+@layout-spacing: 10px;
+@layout-spacing-sm: 5px;
+@layout-spacing-lg: 15px;
+@control-min-width: 180px;
+@control-max-width: 320px;
+@border-radius: 2px;
+@border-width: 1px;
+@border-width-lg: 2px;
 
 // Colors
 // Core colors