I am looking for some nice CSS

Something that will look good on the desktop and on mobile. Here is my wish list:

1. No margin on mobile
2. Decent font size on desktop and mobile
3. Column-style on desktop, should have margins left and right to make it look a bit nicer

The current solution is adapted from Koley. Unfortunately, on mobile this leaves the text too small to read and there are huge margins on the sides and even the option to scroll horizontally if you zoom in. Yuck.

This can apparently be fixed by adding a