I create my own guide for css, for preparing my website development.
https://igmtink.github.io/igmt-css/
Also you can already add my css reset via pasting this line in your html:
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/igmtink/igmt-css/css/igmtink-css-reset.min.css">Special thanks: Inkdrop