discourse/app/assets/stylesheets/common/components/dropdown-menu.scss

.dropdown-menu {
  padding: 0;
  margin: 0;
  list-style: none;

  &__item {
    .btn {
      padding: 0.65rem 1rem;
      width: 100%;
      justify-content: flex-start;
    }
  }

  &__divider {
    margin: 0rem;
  }
}