@charset "UTF-8";

@mixin before($content: null) {
  &::before {
    @if $content == null {
      @content;
    } @else if $content != null {
      $data: str-slice($content, 1, 5);
      @if $data == "data-" {
        content: attr(#{$content});
        @content;
      } @else {
        content: "#{$content}";
        @content;
      }
    }
  }
}