Trouble changing Box Shadow of Muse containing rectangle from Edge Animate animation

i having trouble getting containing rectangle created in muse change it's box shadow onmousover of edge animation.

 

i have found id of containing rectangle , trying access through mouseover code of animation stage.  have tried few methods without success.  expect either of these methods work: -

 

     var thiselement = parent.document.getelementbyid("u8584");

     thiselement.css({ boxshadow: '0px 0px 20px rgba(0, 0, 0, 0.6)' })

 

or

 

     parent.document.getelementbyid("u8584").css({ boxshadow: '0px 0px 20px rgba(0, 0, 0, 0.6)' })

 

any ideas?

looks mixing code types... needed do: -

 

 

      var thiselement = parent.document.getelementbyid("u8584");

      thiselement.style.boxshadow =  '0px 0px 20px rgba(0, 0, 0, 0.6)';

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