What does HackerNews think of classless-css?
A list of classless CSS themes/frameworks with screenshots
Water.css, MVP.css, sakura, and Tacit are among the most popular.
https://github.com/dbohdan/classless-css
And before you say I should do that myself, again, if you want your work to be comfortable to read for the world, the bare minimum involves legibility.
Obviously this approach has its limits, but it works well for proof-of-concept sites or sites that don't need to be very complex or dynamic. Just a sensible font size, nicer looking form elements, etc.
Here is a list of classless CSS frameworks: https://github.com/dbohdan/classless-css
By the way, why not mention the very well tuned Pico.css? https://picocss.com/examples/preview/
I have used water.css, simple.css and Tufte.css and all of them are great.