// Alerts
  
  .alert-variant(@background; @border; @text-color) {
    background-color: @background;
    border-color: @border;
    color: @text-color;
  
    hr {
      border-top-color: darken(@border, 5%);
    }
    .alert-link {
      color: darken(@text-color, 10%);
    }
  }