Milligram CSS is fairly old now (last release in 2017), but it was a game-changer for me and is still one of the first things I reach for.
It's very tiny and minimalist (only 2kb gzipped), and generally "just works" without needing to add classes to everything. And its grid is nearly the same as Bulma, so when you start to need a bit more power it's not too difficult to transition to Bulma.
Milligram CSS is fairly old now (last release in 2017), but it was a game-changer for me and is still one of the first things I reach for.
It's very tiny and minimalist (only 2kb gzipped), and generally "just works" without needing to add classes to everything. And its grid is nearly the same as Bulma, so when you start to need a bit more power it's not too difficult to transition to Bulma.
I discovered Milligram because of the Phoenix Framework that uses it for its basic theme. It is really very elegant.