What bugs me most about most “modern CSS” things is that they have an annoying tendency to have a lot of features backed by javascript when it is entirely unnecessary and harmful to the experience to do so… That’s why I primarily use my own set of CSS.

What about just vanilla css? You can do a lot with flex box and css grid now. For me the biggest advantage of css frameworks were that they took care of browser capability and especially of older browsers… now you don’t need to worry about that so much.

Having said that these seem to be popular searches:

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When I think of something simple Tachyons come to mind.