tiptap/examples/assets/sass/menubar.scss

.menubar {

  margin-bottom: 1rem;
  transition: visibility 0.2s 0.4s, opacity 0.2s 0.4s;

  &.is-hidden {
    visibility: hidden;
    opacity: 0;
  }

  &.is-focused {
    visibility: visible;
    opacity: 1;
    transition: visibility 0.2s, opacity 0.2s;
  }

  &__button {
    font-weight: bold;
    display: inline-flex;
    background: transparent;
    border: 0;
    color: $color-black;
    padding: 0.2rem 0.5rem;
    margin-right: 0.2rem;
    border-radius: 3px;
    cursor: pointer;

    &:hover {
      background-color: rgba($color-black, 0.05);
    }

    &.is-active {
      background-color: rgba($color-black, 0.1);
    }
  }

  span#{&}__button {
    font-size: 13.3333px;
  }
}