CSS: using sticky positioning

Two properties are usually required for sticky positioning behavior: position set to sticky and top set to the desired offset, e.g. .5em, when the element is ‘sticking’ to the top of the viewport or nearest relative container.

Code

<style>
#sticky-1-wrapper {
  position: relative;
  overflow: scroll;
  height: 200px;
}

#sticky-1-wrapper * {
  border: 2px solid gray;
  padding: 1em;
}

#sticky-1-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

#sticky-1-height-setter {
  height: 400px;
}

#sticky-1-sticky {
  position: -webkit-sticky;
  position: sticky;
  top: .5em;
  height: 3.5em;
}

#sticky-1-footer {
  height: 140px;
  background-color: #333;
  color: #ccc;
}
</style>
<div id='sticky-1-wrapper'>
  <div id='sticky-1-header'>Header</div>
  <div id='sticky-1-grid'>
    <div id='sticky-1-height-setter'>Content</div>
    <div id='sticky-1-sticky'>position:sticky; top:.5em;</div>
  </div>
  <div id='sticky-1-footer'>Footer</div>
</div>

Result

Header
Content
position:sticky; top:.5em;

For the most part, this feature is supported by the major browsers. As shown in the example, for Safari the prefix position: -webkit-sticky; is required.

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