@Sandra
Bug report: with Vivaldi on desktop, zoomed to 1.5 (my default), the left side of the main text is cut off. I can scroll a small amount to the right to see the margin notes in full.
@Sandra
> media min-width selectors to use em … isn't supported
are you sure?
quick web search gave https://zellwk.com/blog/media-query-units/
This morning I kept trying with "64em;" and it didn't work, while "1000px" with the semicolon accidentally (but correctly) elided did work. 🤦🏻♀️
Now as you try to zoom in and out you'll see the margin notes pop in and out correctly.
For 1.5 on your width, they belong inside the text ♥