There are 2 ways on how to add a custom CSS to a mobile application. The first one works globally. The second one can work enter globally or locally in a specific section.
Global CSS
1. Create a new module in a "Configuration" section. I named it "UsrMobileStyle". Add needed CSS into a "Less"...MoreLess
I tried Global CSS and its reflected except home screen which appearing just after successful login. Is it possible to apply custom css on home screen?