olour
          applied on, affected by the overlay amount.</li>
          <li>Overlay (linear gradient) - As with overlay, but a linear (straight line) gradient between
          two colours.</li>
          <li>Overlay (radial gradient) - As with overlay, but a radial (circular) gradient between two
          colours.</li>
        </ul>
        <pre><code class="nohighlight"><span class="keyword">val</span><span> </span><span class="identifier">material</span><span>: </span><span class="type-name">Material