have up-to-date browsers, and besides the confusing layout, the colors are clashing with the text.
There should be a couple of things that might make getting around easier on a phone. Under Preferences → Interface there’s a Default Home Page setting, and if you set that to Latest you’ll land on a plain topic list instead of the category boxes, which is a lot less scrolling. On that same page, if you see a color palette dropdown, switching between the light and dark options might give you better contrast until the theme side gets looked at.
If you’re on here often, adding the site to your home screen from your browser menu also gets rid of the browser bars and gives you a bit more room to work with.
The color palette dropdown only shows up if the Guild has more than one palette marked selectable, so you might want to check your own Preferences → Interface page first and drop that line if it isn’t there.