Switch to dark map when using dark style
Not sure if this is possible or feasible, but it would be nice to use a dark map here.

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It should be possible to select a custom tile set. It would probably be worth trying to find a nice matching dark and light tile set
Just a quick Google there's https://openmaptiles.org/
Not sure what the compatibility is
On Google Maps it's possible to set the map style through a json, I suppose that it's possible on OSM too.
I've found this: https://www.thunderforest.com/maps/transport-dark/, not very nice though
There's another dark style available here: https://userstyles.org/styles/173774/openstreetmap-dark-theme This one doesn't seem nice as well, anyway there's a CSS button from where I assume that the style can be downloaded. Maybe it can be a good starting point from who's interested into making a dark theme.
Looks like GNOME maps is using MapBox for tiles and has a dark mode. So that might be a good place to look
Finally the website loaded and I was able to get the dark mode CSS, in case someone needs it: https://gist.github.com/funder7/7cb4c9440245e1d9557a83439f69128a