resources/scss/bootstrap/mixins/_labels.scss

   1 // Labels
   2
   3 @mixin label-variant($color) {
   4   background-color: $color;
   5
   6   &[href] {
   7         &:hover,
   8         &:focus {
   9           background-color: darken($color, 10%);
  10         }
  11   }
  12 }