[CyanDeparture]

I think this is quite an opinionated version of nicer and better. I'm personally not a fan of the thin fonts. If it was framed as a class of CSS styles to make websites have that style of super-thin fonts I'd be ok with it. My issue with this is the framing of what the CSS library is.

[unfocussed_mike]

There are some small unresolved issues with line, heading and paragraph spacing too (particularly around multi-line list items here).

Which is not to be overly critical because a lot of this stuff is art more than science, and it's hard to pin down precisely what is wrong without recalculating quite a lot, but I don't think this feels quite as balanced as it could.