That is interesting,
I was just emailed by a client saying that this was not working for them on Edge so I quickly revised the CSS to use a web standard. A shot in the dark as I'm a Mac user so don't use Edge or IE, but suspected that it was this URL call.
You're correct the auto should work in theory but wasn't in this case...
Courses and course formats
Hover pointer not appearing on Grid layout Edge/IE FIX
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