title: remove border, padding from Dialog
body: <p>I have an activity which is with the theme Theme.Transparent which is:</p>
  
  <pre><code>&lt;style name="Theme.Transparent" parent="android:Theme.Dialog"&gt;
      &lt;item name="android:windowIsTranslucent"&gt;true&lt;/item&gt;
      &lt;item name="android:windowNoTitle"&gt;false&lt;/item&gt;
      &lt;item name="android:windowIsFloating"&gt;true&lt;/item&gt;
      &lt;item name="android:backgroundDimEnabled"&gt;false&lt;/item&gt;
      &lt;item name="android:gravity"&gt;top&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>i'm trying to get rid of the border and the padding around it.. i want to make fill the horizontal of the screen. and no gray border.
  please help :)
  <img src="https://i.stack.imgur.com/0QcfY.jpg" alt="enter image description here"></p>