gitlab-org--gitlab-foss/app/assets/stylesheets/framework/asciidoctor.scss

.admonitionblock td.icon {
  width: 1%;

  [class^="fa icon-"] {
    @extend .fa-2x;
  }

  .icon-note {
    @extend .fa-thumb-tack;
  }

  .icon-tip {
    @extend .fa-lightbulb-o;
  }

  .icon-warning {
    @extend .fa-exclamation-triangle;
  }

  .icon-caution {
    @extend .fa-fire;
  }

  .icon-important {
    @extend .fa-exclamation-circle;
  }
}