Bootstrap/scss/mixins/_text-emphasis.scss

// stylelint-disable declaration-no-important

// Typography

@mixin text-emphasis-variant($parent, $color) {
  #{$parent} {
    color: $color !important;
  }
  @if $emphasized-link-hover-darken-percentage != 0 {
    a#{$parent} {
      &:hover,
      &:focus {
        color: darken($color, $emphasized-link-hover-darken-percentage) !important;
      }
    }
  }
}