pleroma/app/styles/components/buttons.scss

button,
a.button {
  &.standard {

    // NOTE - will define the larger standard buttons here and apply class where used.

    &-small {
      @include font-size(11);
      @include line-height(11);
      @include font-weight(bold);
      height: 20px;
      padding: 5px 15px;
      border: 0;
      border-radius: 4px;
      text-transform: uppercase;
      color: #fff;
      background: #607cf5;
    }
  }

  i.fa {
    margin-right: 0.6em;
  }
}