Bootstrap/docs/assets/scss/_anchor.scss

// //
// // Store the link icon as a base64 embedded icon font.
// //
// @font-face {
//   font-family: 'anchorjs-icons';
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//   font-style: normal;
//   font-weight: normal;
// }
//
// .anchorjs-icon {
//   font-family: 'anchorjs-icons';
//   font-style: normal;
//   font-variant: normal;
//   font-weight: normal;
//   line-height: 1;
//   speak: none;
//   text-transform: none;
//
//   // Better Icon Rendering
//   -webkit-font-smoothing: antialiased;
//   -moz-osx-font-smoothing: grayscale;
// }
//
// //
// // Link placement and hover behavior.
// //
// .anchorjs-link {
//   opacity: 0;
//   text-decoration: none;
// }
// *:hover > .anchorjs-link,
// .anchorjs-link:focus  {
//   // To fade links as they appear, change transition-property from 'color' to 'all'
//   opacity: 1;
//   transition: color .16s linear;
// }
//
// //
// // Make screen-reader friendly description text visually hidden.
// //
// .anchorjs-description {
//   border: 0;
//   clip: rect(0 0 0 0);
//   height: 1px;
//   margin: -1px;
//   overflow: hidden;
//   padding: 0;
//   position: absolute;
//   width: 1px;
// }
//
// //
// // Reasonable default styles.
// // Feel free to override or replace these with your own.
// //
// // .anchorjs-link:link    { color: #DFD487; }
// // .anchorjs-link:visited { color: #DFD487; }
// // .anchorjs-link:hover   { color: #EC7963; }
// // .anchorjs-link:active  { color: #EC7963; }
//
// .anchorjs-link {
//   float: left;
//   width: 1.2em;
//   height: 1em;
//   padding-right: .2em;
//   margin-top: .25em;
//   margin-left: -1.2em;
//   font-size: 70%;
//   color: inherit;
//   text-align: center;
// }
// *:hover > .anchorjs-link:hover {
//   color: $brand-primary;
//   text-decoration: none;
// }
//
// // .anchorjs-icon {
// //   font-size: 90%;
// //   padding-left: 6px;
// // }
//
// .anchorjs-icon:before {
//   content: '\e600';
//   // alternative icons -- uncomment to use
//   //
//   // content: '#';
//   // content: '¶';
//   // content: '❡';
//   // content: '§';
// }
//
// @include media-breakpoint-down(sm) {
//   .anchorjs-link {
//     display: none;
//   }
// }


//
// AnchorJS Styles
//

.anchorjs-link {
  color: inherit;
}

@media (max-width: 480px) {
  .anchorjs-link {
    display: none;
  }
}

*:hover > .anchorjs-link {
  opacity: .75;
  -webkit-transition: color .16s linear;
       -o-transition: color .16s linear;
          transition: color .16s linear;
}

*:hover > .anchorjs-link:hover,
.anchorjs-link:focus {
  text-decoration: none;
  opacity: 1;
}