I like layering the comments over the video, with half the text pushing into the video space. It works nicely most of the time but ocassionally (at least on Chrome), this breaks and the comments are behind the video and so no legible.

Working: http://dev-critter.tc.columbia.edu/vialogues/overlapped_working.png

Broken: http://dev-critter.tc.columbia.edu/vialogues/overlapped_broken.png

Can we make this more consistent?