title: QPushButton stylesheet when setCheckable(true)
body: <p>When I use</p>
  
  <pre><code>myButton-&gt;setCheckable(true);
  </code></pre>
  
  <p>There is -I don't know how to call it- a sort of grid :</p>
  
  <p><img src="https://i.gyazo.com/93e19ad779d5bf682d93a17299dbd86f.png" alt="myImage"></p>
  
  <p>Is it possible to not have this grid and here just my green background ?</p>