Bootstrap CSS class .text-black-50

<p class="text-black-50">I'm a text with 50% opacity black.</p>

/* _text.scss:51 */
.text-black-50 { color: rgba($black, .5) !important; }
.text-white-50 { color: rgba($white, .5) !important; }

// Misc

.text-hide {
  @include text-hide($ignore-warning: true);
}