Borders of menus not clear in dark mode

I am often confused by where the boundaries of the menus are in dark mode:
188BET靠谱吗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:
188BET靠谱吗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:
188BET靠谱吗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.

188BET靠谱吗Zotero 7.0.3-beta.2+10d27b8f6 (64-bit)
Windows 10
Sign Inor Registerto comment.