Create three.js application for pc smartphone and ipad

do you know what’s the best way to create one application with three.js and webassembly that is easy to adapt to pc smartphone and ipad. I have some fix button in my application and on smartphone are too small and some custom component create with javascript that should fit different resolution depending on device.

Sry, your question is way too broad. IF your issue is about responsive design, I suggest you study the existing resource on the web. Otherwise try to be more specific and illustrate your issue with an example.