Hello Tom,
It has not worked for me,
I put the CSS in child theme css styles, then I copied the codes with different measures and the post if it looks but not in the category
attached images
http://www90.zippyshare.com/v/f1aOioxv/file.html
http://www107.zippyshare.com/v/GNVIOTSn/file.html
I think need a plugin, knows some plugin to adapt the video function measures the container and work with videos and dailymotion and youtuve ??
Thank you