What version are you running?
3.0.6
What's the URL of the page containing the problem?
<review-id>/diff/1/#
What steps will reproduce the problem?

Make sure the last line of the last file has a comment/issue
Hover on the number
The popup is not fully visible


What is the expected output? What do you see instead?

What operating system are you using? What browser?
Firefox on Linux
Please provide any additional information below.