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<p>Several Bootstrap components utilize <code>z-index</code>, the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that’s been designed to properly layer navigation, tooltips and popovers, modals, and more.</p>
<p>These higher values start at an arbitrary number, high and specific enough to ideally avoid conflicts. We need a standard set of these across our layered components—tooltips, popovers, navbars, dropdowns, modals—so we can be reasonably consistent in the behaviors. There’s no reason we couldn’t have used <code>100</code>+ or <code>500</code>+.</p>
<p>We don’t encourage customization of these individual values; should you change one, you likely need to change them all.</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-scss" data-lang="scss"><span class="nv">$zindex-dropdown</span><span class="o">:</span> <span class="mi">1000</span><span class="p">;</span>
<span class="nv">$zindex-sticky</span><span class="o">:</span> <span class="mi">1020</span><span class="p">;</span>
<span class="nv">$zindex-fixed</span><span class="o">:</span> <span class="mi">1030</span><span class="p">;</span>
<span class="nv">$zindex-offcanvas-backdrop</span><span class="o">:</span> <span class="mi">1040</span><span class="p">;</span>
<span class="nv">$zindex-offcanvas</span><span class="o">:</span> <span class="mi">1045</span><span class="p">;</span>
<span class="nv">$zindex-modal-backdrop</span><span class="o">:</span> <span class="mi">1050</span><span class="p">;</span>
<span class="nv">$zindex-modal</span><span class="o">:</span> <span class="mi">1055</span><span class="p">;</span>
<span class="nv">$zindex-popover</span><span class="o">:</span> <span class="mi">1070</span><span class="p">;</span>
<span class="nv">$zindex-tooltip</span><span class="o">:</span> <span class="mi">1080</span><span class="p">;</span>
</code></pre></div>
<p>To handle overlapping borders within components (e.g., buttons and inputs in input groups), we use low single digit <code>z-index</code> values of <code>1</code>, <code>2</code>, and <code>3</code> for default, hover, and active states. On hover/focus/active, we bring a particular element to the forefront with a higher <code>z-index</code> value to show their border over the sibling elements.</p>
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