title: How to remove border/shadow from lollipop buttons
body: <p>The buttons looks fine for api &lt; 21. However, the +21 versions creates this border or shadow that is shown on the image below. How do I get rid of it without changeing the hole theme, but setting a style variable?</p>
  
  <p><img src="https://i.stack.imgur.com/V1o5t.png" alt="enter image description here"></p>
  
  <p>It might be more clear on this colored image. There is some kind of border around the buttons.
  <img src="https://i.stack.imgur.com/vw6hB.png" alt="enter image description here"></p>
  
  <p>My buttonssstyle is defined like this:</p>
  
  <pre><code>&lt;style name="buttonTransparent" parent="Base.TextAppearance.AppCompat.Button"&gt;
          &lt;item name="android:background"&gt;#00000000&lt;/item&gt;
          &lt;item name="android:textColor"&gt;@drawable/button_text_blue&lt;/item&gt;
          &lt;item name="android:textSize"&gt;18dp&lt;/item&gt;
          &lt;item name="android:textAllCaps"&gt;false&lt;/item&gt;
          &lt;item name="android:minHeight"&gt;45dp&lt;/item&gt;
      &lt;/style&gt;
  
  &lt;style name="buttonLargeWhite" parent="buttonTransparent"&gt;
          &lt;item name="android:background"&gt;#FFF&lt;/item&gt;
          &lt;item name="android:layout_marginTop"&gt;10dp&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>