which framework is best for css ?

Answer 1

Use Foundation, it's has grid format in latest version which would make styling more accurate and easier.

The css elements is more stylish.

And don't use bootstrap, too many websites using it.

Answer 2

This site will tell u all about the top most frameworks used for css.
https://www.themexpert.com/blog/top-5-responsive-css-framework

Happy to help😊😊

Answer 3

I work a lot with the bootstrap, but foundation is good too.

The link shared by Prince PS have good information about the this frameworks and others.