devdocs/assets/stylesheets/pages/_react.scss

._react {
  @extend %simple;

  .note {
    @extend %note;
    h4 {
      margin-top: .25rem;
      margin-bottom: .5rem;
    }
  }

  .note-orange {
    @extend %note-orange;
  }

  .note-blue {
    @extend %note-blue;
  }

  .note-green {
    @extend %note-green;
  }

}