1 files changed, 41 insertions, 0 deletions
diff --git a/app/assets/stylesheets/page_bundles/boards.scss b/app/assets/stylesheets/page_bundles/boards.scss
index 3d1ae3519a9..620b37914d8 100644
--- a/app/assets/stylesheets/page_bundles/boards.scss
+++ b/app/assets/stylesheets/page_bundles/boards.scss
@@ -138,6 +138,47 @@
   border: 1px solid var(--gray-100, $gray-100);
 }
 
+// to highlight columns we have animated pulse of box-shadow
+// we don't want to actually animate the box-shadow property
+// because that causes costly repaints. Instead we can add a
+// pseudo-element that is the same size as our element, then
+// animate opacity/transform to give a soothing single pulse
+.board-column-highlighted::after {
+  content: '';
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  pointer-events: none;
+  opacity: 0;
+  z-index: -1;
+  box-shadow: 0 0 6px 3px $blue-200;
+  animation-name: board-column-flash-border;
+  animation-duration: 1.2s;
+  animation-fill-mode: forwards;
+  animation-timing-function: ease-in-out;
+}
+
+@keyframes board-column-flash-border {
+  0%,
+  100% {
+    opacity: 0;
+    transform: scale(0.98);
+  }
+
+  25%,
+  75% {
+    opacity: 1;
+    transform: scale(0.99);
+  }
+
+  50% {
+    opacity: 1;
+    transform: scale(1);
+  }
+}
+
 .board-header {
   &.has-border::before {
     border-top: 3px solid;