30 seconds of CSS

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Last item with remaining available height  layout

Take advantage of available viewport space by giving the last element the remaining available space in current viewport, even when resizing the window.

<div class="container">
  <div>Div 1</div>
  <div>Div 2</div>
  <div>Div 3</div>
body {
  height: 100%;
  margin: 0;

.container {
  height: 100%;
  display: flex;
  flex-direction: column;

.container > div:last-child {
  background-color: tomato;
  flex: 1;
Div 1
Div 2
Div 3
  1. height: 100% set the height of container as viewport height.
  2. display: flex enables flexbox.
  3. flex-direction: column set the direction of flex items' order from top to down.
  4. flex-grow: 1 the flexbox will apply remaining available space of container to last child element.
  5. The parent must have a viewport height. flex-grow: 1 could be applied to the first or second element, which will have all available space.
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⚠️ Needs prefixes for full support.