title: In GWT, how to reference an external (obfuscated) CSS in another CSS file
body: <p>I am using a GWT library that defines a CssResource with some class names in the associated css file, e.g. .someWidget {...}</p>
  
  <p>Now in my code I would like to reference this 'external' and possibly obfuscated class name in my own css file. For instance to do:
  .someWidget.animated {...}</p>
  
  <p>Is there a way to achieve this?</p>
  
  <p>(I know I could use @external .boxWidget if I would have control over the external library)</p>