By the way of discussion about the recent UI standardization on Special:Watchlist, the FlaggedRevs message was mentioned. Small font-size with no reason, totally random colours of background and border, as well as totally random margin. Sadly, its CSS isn't editable on local MediaWiki: pages (in contrast to Watchlist-summary).
screenshot by courtesy of @matmarex
and that's how it looks with uselang=qqx.