Bug
Fragment of a discussion from Support/LiquidThreads
background-size: 135px 135px
from MediaWiki:Common.css isn't being applied to .mw-wiki-logo
. That's likely phab:T73621, caused by 'fixing' phab:T72672. So either $wgAllowSiteCSSOnRestrictedPages is switched on, or the logo image would need to be made a square.
Having a square version of the logo would be helpful.
I also noticed that the logo is not configured to be shown in the new Vector skin.
@Nike: it wouldn't be better to use "background-repeat: no-repeat; background-position: right center !important; background-size: contain;" instead of "background-size: 135px 135px"?