Hack the CSS to make the titles display approximately correct.

The css for the anonymous content relies on double-nesting
for correctly wrapping the caption text and aligning it at
the bottom of the video frame (I think) but the code isn't
wrapping it in a <p> so that doesn't work.

Instead, manually add enough padding so that it shows in
a reasonable position on the presentation page. Note from
the value I suspect we might be calculating some sizes
incorrectly for the anonymous caption div.