Semantic CSS files with the styles I'm using as my default the moment.
Styles.css and prestyles.css are in use at alecgargett.space.
Licensed under Alec Gargett Conditional Copyleft Creative License (Summary: permission to use or modify in any way with fair attribution where convenient, without compensation in cases without large resulting increases in profits, but with fair payment in cases of a large increase in profits resulting from that use. Similar to Creative Commons Attribution-ShareAlike (CC BY-SA) but with fair compensation in cases of large resulting increases in profits, and a commitment not to be a copyright troll.)