When the map is scrolled down, the map lines overlap the heading. See,
You can observe this live in https://observablehq.com/@anjana/the-power-of-js-generators
oops!! we just tweaked some sidebar styles and the minimap title and looks like we missed that. good catch, thank you! i just submitted a PR to fix. a one-character fix lol
fix deployed
thanks again for clear bug report with screenshot and nice reproducible example 
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Awesome!