html5 - how remove background in new version of runtime in google swiffy -

I use Google swiffy to convert swf file to html5. But now Google has been upgraded to runtime v 5.2 and transparent background can not be used. Before I use the google swiffy html5's 4.9 runtime from the swf file and remove it from my javascript file to use it in Google code:

  "backgroundcolor": - 1 ,   
 but now the runtime has been upgraded to v5.2 and I can not remove the background color from the swiffy file  
   < P> 
 
 This solution works perfectly with Flash CS5 - & gt; Swiffy v5.3!  
  #swiffycontainer rect {background: none! Important; Exhibit: None! Important; }