title: How to make Toolbar transparent?
body: <p><strong>It is self Q&amp;A post</strong>
  I have transparent ActionBar which overlays layout. After migration to the latest support library I have been forced to get rid off the ActionBar in favor of the Toolbar. The old ways to make it transparent and overlay that layout doesn't work anymore.</p>
  
  <pre><code>&lt;style name="CustomActionBarTheme" parent="@android:style/Theme.AppCompat"&gt;
      &lt;item name="android:windowActionBarOverlay"&gt;true&lt;/item&gt;
      &lt;item name="windowActionBarOverlay"&gt;true&lt;/item&gt;
      &lt;item name="android:actionBarStyle"&gt;@style/TransparentActionBar&lt;/item&gt;
  &lt;/style&gt;
  
  &lt;style name="TransparentActionBar" parent="@android:style/Widget.Holo.Light.ActionBar"&gt;
      &lt;item name="android:background"&gt;@android:color/transparent&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>