Borders of menus not clear in dark mode

I am often confused by where the boundaries of the menus are in dark mode:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/n2v00mv7v707pay3o6a2.png

The background color of the menus is the same as the rest of the UI, and the black border is nearly invisible.

In Thunderbird, the border of the menus is a lighter grey color, and the background is also less dark, which is easier to distinguish:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/pcu69wz9bufk21kjjlzy.png

In Firefox, it is the same, with an even lighter grey for the background of the menus:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/k2wgtgvqpntkq1w1a7xi.png

Is it possible to improve the visibility of the menus in dark mode?
It is the same problem also for all the separate windows, like the Debug Output or PDF Reader windows.

Zotero 7.0.3-beta.2+10d27b8f6 (64-bit)
Windows 10
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