reduce paragraph margin

[Rich-Harris]

We previously bumped the paragraph margin to 1lh (#541), but having sat with it a while I think that was a mistake. We've had feedback — which I agree with — that the relationship between headings and copy is unclear. It also results in lower-than-ideal information density.

While 1lh is considered something of a 'rule' in typography, I do think this works better in basically all cases (old on the left, new on the right):

[benmccann]

I agree that 1lh seems like a lot and we could do less. it does feel a little close together now, but not by much. what do you think about giving it just a tad more at 0.6lh?

Suggested change

	margin: 0.5lh 0;
	margin: 0.6lh 0;

[Rich-Harris]

Typography people like to talk about 'vertical rhythm' — that's where the 1lh came from in the first place. We're breaking that rule in a lot of places (we'd need to build the whole thing from scratch rather than merely changing the old site if we wanted to be really serious about it) but I do think that 'things should be multiples of each other' is sage advice that we should adhere to:

With 0.6lh, everything becomes... bumpy. Just very slightly off:

[benmccann]

I think we could also reduce the margin between headings. E.g. the margin-top on h2 could go from 7rem to maybe 5rem

After that, we could potentially use some of the reclaimed vertical space to tweak the line-height on small screens where Georgia is used, which currently feels quite scrunched. It feels a bit more comfortable to me bumping it from 1.5 to 1.65

[Rich-Harris]

tweak the line-height on small screens where Georgia is used, which currently feels quite scrunched

That was recently changed at @dummdidumm's behest

[dummdidumm]

Have you seen #698? Takes a more complete approach to this; there's a few other places where spacing tweaks are sorely needed

[dummdidumm]

After that, we could potentially use some of the reclaimed vertical space to tweak the line-height on small screens where Georgia is used, which currently feels quite scrunched

I can't go back to what it was before, it was all swimmy loosy-goosy with so much line-height

[Rich-Harris]

I'm looking at it now, yeah. I think there's good stuff in there but 0.5lh works better, looking at them side-by-side (and also for the reasons given above) — in general I think we should probably prefer to use lh units than rem for typography (as opposed to layout). I'll make suggestions on that PR

[Rich-Harris]

closing in favour of #698