Visit https://en.wikipedia.org/wiki/SATB?useskin=minerva while logged in with page previews enabled via Beta features (https://en.wikipedia.org/wiki/Special:Preferences)
Note the horizontal line that cuts through the preview here:
Seems to be caused by a css rule in Minerva for all footer elements. This css rule should be restricted to the skin chrome so it doesn't apply here.
Replication steps
- Install Popups and MobileFrontend and Minerva skin
- Hover over a link to see a page preview. Note the line above the cog.
Testing
Before and after your change the Minerva footer should look the same
The footer css rule should only impact the Minerva footer.

