There seems to be an issue with some browser's displaying YouTube video on top of other element within Bridge Element websites. This seems to be an ongoing issue with youtube embed videos as a whole. We have found many blogs and posts in connection with this issue.
We have found a fix at this site.
This fix is pretty simply. Just add "?wmode=opaque" follow your youtube url in iframe src attribute. Like this,
<iframe width="480" height="360" src="http://www.youtube.com/embed/doGU7jL6epI?wmode=opaque" frameborder="0" allowfullscreen></iframe>