What version are you running?
4.0 alpha 0 (dev)

What's the URL of the page containing the problem?
https://reviews.reviewboard.org/users/mike_conley/
What steps will reproduce the problem?

Go to https://reviews.reviewboard.org/users/mike_conley/
Look at the tabs above the table.


What is the expected output? What do you see instead?
The tabs are visually disconnected from the table. They should be connected.

What operating system are you using? What browser?
macOS 10.15.6 Catalina. Tested in Firefox Nightly (82.0a1) and Google Chrome 85.0.4183.102.

Please provide any additional information below.