Apply Nord Theme It's cool, it's blue, it's nord! The light theme is a little big rougher, and the syntax highlighting needs work, but it's most of the way there.
Add Prism.js for Syntax Highlighting Earmark can't do it, and prism.js is focussed on loading only what you need, which I can appreciate. Code blocks look mostly okay without it in case people disable JS.
Set up Tailwind It's the easiest way to do CSS these days, and I am lazy.