**Steps to replicate the issue** (include links if applicable):
* Become a temp users in Minerva
* Open an overlay
**What happens?**:
The black outline from the tooltip shows above the overlay
https://phabricator.wikimedia.org/F37152477
**What should have happened instead?**:
The overlay should go on top of the tooltip, and the tooltip button shouldnt have any outline
**Software version** (skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
### Developer notes
The 2 issues are both because of CSS thats applied to .mw-temp-user-banner-tooltip. These styles apply `color: black`, but actually messes up the codex button styles, and `z-index`, which also causes the button to go over overlays. both styles probably should be applied to the tooltip body rather than the container
## QA steps
https://phabricator.wikimedia.org/T342935#9078074