side>
      z-depth = 2
    </aside>
  </section>

  <section>
    <!-- Example of using paper-shadow by adding a class directly -->
    <div>
      <div class="card paper-shadow-top-z-3">
        <div class="card-inner paper-shadow-bottom-z-3">
        </div>
      </div>
    </div>
    <aside>
      z-depth = 3
    </aside>
  </section>

  <section>
    <div>
      <div class="card paper-shadow-top-z-4">
        <div class="card-inner paper-shadow-bottom-z-4">
        </div>
      </div>
    </div>
    <a