Here's a quick link to a page Vibha and I started as a scratchpad for a list of page styling issues we've identified in particular articles.
https://etherpad.wikimedia.org/p/App_Page_Styling
Wanted to share this as an initial touchpoint for surfacing some small styling tweaks that may need to be made to MobileApp css files.
https://gerrit.wikimedia.org/r/137504 also adds the enwiki Mobile.css hacks into the ResourceLoader module, so that should improve styling as well.
You can also instead test on the Android app :D