Setting Transperancy To Modal Popup Containing an iFrame

Setting Transperancy To Modal Popup Containing an iFrame

Hello, I am showing a pdf in the background and a Popup over the top which contains an iFrame I want to set the transparency to the popup.

It works perfectly in Chrome browser and the rest it doesn't work :( Here is the Fiddler Link : Click Here 

Please Tell Me What should i do to work in all the browsers.