The bottom padding of the open bounty notification seems to be a bit off to me. If there are no comments, the "add a comment" link overlaps with the bounty div, especially on hover. WIth comments it seems to be barely OK. At the moment you can see an example here: What is the default chinese font on Android?
Here's a screenshot:
Tested with OSX Chrome 36.0.1985.125 and Safari 7.0.5