Very clean and simple, but not trivial or bare. Really good job, jmstfv.
I've been experimenting with functional (atomic) CSS lately and built a small framework that ended up using in Hexadecimal (if you peek at the source code, you can see weird classes like m-0, p-0, etc..). I liked it, but one should be careful in not overusing it, otherwise, it is an unmaintainable mess, yet again.
Below, I linked my Netlify config [0]. My static files live in the src/ folder, so you should probably change that if you have them in a different folder. If you don't know what Content-Security-Policy (CSP) or Strict-Transport-Security (HSTS) headers do, leave them out. It is easy to shoot yourself in the foot if you don't know what you're doing.
[0] https://privatebin.net/?c794ba90771f6e10#GSnJJ3dnd5r3ZDGgi9R...