papercss/src/components/_breadcrumb.scss

ul.breadcrumb {
  list-style: none;
  padding: 10px 16px;

  li {
    display: inline;
    font-size: 20px;

    &::before {
      content: '';
    }

    a {
      @include color('color', 'secondary');
      background-image: none;
      text-decoration: none;

      &:hover {
        text-decoration: underline;
      }
    }
  }

  li + li::before {
    content: '/\00a0';
    padding: 8px;
  }
}