I've had a good experience so far working on an admin dashboard with BeerCSS (and Datastar which is unrelated). It implements a lot of the Material Design stuff and it is opinionated but between the examples on the main site and documentation on GitHub it was pleasant to work with. It's easy to get started too, just add three links in the <head>.
https://github.com/beercss/beercss
https://www.beercss.com/