MINI

C:/xampp/htdocs/123/bower_components/bootstrap/less/mixins/

files >> C:/xampp/htdocs/123/bower_components/bootstrap/less/mixins/background-variant.less

 // Contextual backgrounds

.bg-variant(@color) {
  background-color: @color;
  a&:hover,
  a&:focus {
    background-color: darken(@color, 10%);
  }
}