I'm using React with an Express backend to build a web-app.
It looks fine locally, as well as on the deployed Heroku site or a custom domain, but only on my computer.
As soon as I try to access it on my phone or on another computer, the CSS doesn't seem to load at all (I just see a mess of images and text).
What could be going wrong? I'm not sure what details I need to give so please let me know and I will happily supply them