Windows has this small overlay that appears when you change the volume

I am implementing a similar notification overlay, and I would like to describe it sequentially with this existing overlay without the magic values of hard coding. Is there a way to access the colors, fonts, fonts and / or positions associated with this?
The music information comes from the Groove Music app, and I'm not sure if this is available for custom applications, but the volume bar is system-wide and I hope I can get some basic information about it.
Neither GetSysColor nor GetThemeSysColor seem to have any colors that match.
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