@vcl/vcl/theme/demo/example-shadows.html

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<div>
  <h3>Shadows</h3>
  <div class="col demo">
    <div class="row center">
      <div class="label">--glass-1</div>
      <div class="color glass1"></div>
    </div>
    <div class="row center">
      <div class="label">--glass-2</div>
      <div class="color glass2"></div>
    </div>
  </div>
</div>