fix youtube embed z-index problems

youtube embedded videos (iframes) usually prevent other DOM elements from the host page to be displayed over them.

to fix this add simply the

wmode=opaque

parameter to your embed url

or specify the wmode in the call to the YouTube javascript API

player = new YT.Player('player', {
      height: '381',
      width: '681',
      wmode: 'opaque', // Add this!!
      ...