src/scss/bootstrap-4.0.0-alpha.6/scss/utilities/_position.scss

   1 // Positioning
   2
   3 .fixed-top {
   4   position: fixed;
   5   top: 0;
   6   right: 0;
   7   left: 0;
   8   z-index: $zindex-fixed;
   9 }
  10
  11 .fixed-bottom {
  12   position: fixed;
  13   right: 0;
  14   bottom: 0;
  15   left: 0;
  16   z-index: $zindex-fixed;
  17 }
  18
  19 .sticky-top {
  20   position: sticky;
  21   top: 0;
  22   z-index: $zindex-sticky;
  23 }