another one i'm using for my site [1] is tacit[2] it's pretty basic but it works well - although i've been trying to find a well structured, well designed css framework with no classes - I haven't found one of my liking, I think the best way would be to use something very minimal like tailwindcss [3] which i still have to try
[1] https://golang.cafe [2] https://github.com/yegor256/tacit [3] https://tailwindcss.com