title: Change default dark background in UWP
body: <p>I'm trying to change default black background to #111. Here is the code that i tried to use</p>
  
  <pre><code>    &lt;ResourceDictionary x:Key="Dark"&gt;
  
          ...
  
          &lt;Color x:Key="SystemAltHighColor"&gt;#111&lt;/Color&gt;
          &lt;SolidColorBrush x:Key="SystemAltHighColorBrush" Color="{StaticResource SystemAltHighColor}"/&gt;
          ...
  
      &lt;/ResourceDictionary&gt;
  </code></pre>
  
  <p>But it doesn't work. What i'm doing wrong?</p>