Non Logged in user incorrect z index on create an account

[GerbilGrenade22]

Viewing comments on a page in reddit while not logged in displays a section that says "Want to add to the discussion?" among other things. This has a higher Z index than the "Sorted By: Best" div, so when you click the dropdown you cannot select anything else behind it.

You can resolve this by making the z-index of <section class="infobar `commentsignupbar"> be -1 or lower. Issue appears in Chrome, Firefox, and Edge.

See https://imgur.com/a/L5dky for an example.