title: How to darken page when video plays?
body: <p>I've seen this done a few times where the entire page will go dark or black while the video is playing. I'm wondering how this can be done using HTML CSS or Javascript. </p>
  
  <p>Here's an example of what I mean: <a href="http://allmyvideos.net/vc0uqldjebnz" rel="nofollow">http://allmyvideos.net/vc0uqldjebnz</a></p>