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You can remove all the author's CSS with one click of Firefox's Reader View. The HTML is structured just fine, so this this works very well.

1em can not be at fault it's literally 'whatever font size parent has' the culprit is somewhere else.

Which is specifically the body text size, no?

yeah, but that's the issue: hs and ps are both coded to the same size which happens to be 1rem

i.e. 1rem hs would be ok if you'd had 0.8rem ps, and conversely you'd have the same issue if both were coded to be 2rem

ctrl - will decrease the font size on your browser. (ctrl + increases; ctrl 0 resets it to the specified size).