CSS Problems

I have a Facebook like button on my website and the Facebook Like Button popup window was getting cut off. I tracked the problem down to the CSS in this plugin.

video, embed, iframe, object { max-width: 100%; }

This line causes problems for other content of these types that needs to have a fixed width. I don’t really see any need for this line of code anyway and it seems to work fine without it? What reason is there for this line of CSS? Thank you. Really like the plugin otherwise.

http://ww.wp.xz.cn/extend/plugins/responsive-video-light/