gab-social/app/javascript/gabsocial/components/display_name/display_name.scss

.display-name {
  display: block;
  max-width: 100%;

  @include text-overflow(break-word);

  &__html {
    font-weight: 600;
    padding-right: 4px;
  }

  &__account {
    font-size: 14px;
  }
}