how remove background in new version of runtime in google swiffy

Question

I use google swiffy for convert my swf file to html5. But now google is upgraded runtime to v 5.2 and can't use transparent background. Before i use runtime v 4.9 of google swiffy html5 from swf file and in google code i remove this from my javascript file for use transparenty background:

"backgroundColor":-1,  

But now runtime is upgraded to v5.2 and i can`t remove background color from swiffy file

https://www.gstatic.com/swiffy/v5.2/runtime.js

Answer 1

<style type="text/css" media="screen">
#div *:first-child {
      background-color: transparent !important;
}
</style>