@mixin alert-variant($background, $border, $text-color) {
  color: $text-color; // add
  background-color: $background; // add
  border-color: $border; // add

  .close {
    color: $text-color;

    &:hover, &:focus {
      color: $text-color;
    }
  }
}

@mixin alert-alt-variant($border, $text) {
  border-color: $border;

  a, .alert-link {
    color: $text;
  }
}