notifications-admin/app/assets/stylesheets/components/file-upload.scss

.js-enabled {

  .file-upload {

    &-label {
      @include bold-19;
      display: block;
      margin: 0 0 10px 0;
    }

    &-field {
      width: 0.1px;
      height: 0.1px;
      opacity: 0;
      overflow: hidden;
      position: absolute;
      z-index: -1;

      &:focus + .file-upload-button {
        outline: 3px solid $yellow;
      }

    }

    &-button {
      @include button($button-colour);
      display: inline-block;
    }

    &-filename {
      @include bold-19;
      display: inline-block;
      padding-left: $gutter-half;
    }

  }

}