Example
Markup: components/molecules/breadcrumb/breadcrumb.twig
<ul class="breadcrumb ">
      <li class="breadcrumb-item">
              <a href="#">Home</a>
          </li>
      <li class="breadcrumb-item">
              <a href="#">Level 1</a>
          </li>
      <li class="breadcrumb-item">
              <a href="#">Level 2</a>
          </li>
      <li class="breadcrumb-item">
              Current item
          </li>
  </ul>
Source: components/molecules/breadcrumb/_breadcrumb.scss, line 1