  <div class="demo-preview-block demo-page--shadow">
    <div class="demo-shadow-card mdl-shadow--2dp">2dp</div>
    <div class="demo-shadow-card mdl-shadow--3dp">3dp</div>
    <div class="demo-shadow-card mdl-shadow--4dp">4dp</div>
    <div class="demo-shadow-card mdl-shadow--6dp">6dp</div>
    <div class="demo-shadow-card mdl-shadow--8dp">8dp</div>
    <div class="demo-shadow-card mdl-shadow--16dp">16dp</div>
  </div>