title: jQuery UI dialog overlay - how to set different background colors for different dialogs
body: <p>I have used different jQuery dialogs. For some dialogs I want a transparent background.
  If I change the <code>background</code> CSS in the <code>.ui-widget-overlay</code> class then it will apply to all the dialogs.</p>
  
  <p>How to set different background colors for different dialogs?</p>