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Bootstrap class: .sticky-top

<div class="sticky-top bg-primary">Sticky top</div>

Preview

Sticky top

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Sass source

/* _position.scss:31 */
.sticky-top {
  @supports (position: sticky) {
    position: sticky;
    top: 0;
    z-index: $zindex-sticky;
  }
}

Uses variables

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/* _position.scss:31 */
$zindex-sticky

More in Bootstrap Positioning

Bootstrap 4 & 5