title: javafx and fxml based transparent background
body: <p>There are many ways to make background of a pane or background scene as transparent.</p>
  
  <pre><code>e.g http://stackoverflow.com/questions/12717487/how-to-implement-a-transparent-pane-with-non-transparent-children
  </code></pre>
  
  <p>but how can I do that if i have an application made in fxml and controller based files? </p>
  
  <p>when I already have made an application in fxml based files and the layout has an AnchorPane at the base and some other panes above it. how do I actually make the white background to transparent or semi transparent?</p>