Question about how to set color of second-child navigator bar

[Youpu-Chen]

Hi there.

I am trying to use your nice dark theme on my Zotero, but I found some of my navigator bars did not change.

It's the navigator bar added by the extension zotero better notes.

I added the code by myself like below, but it did not work.

If you could give me a hint, I'll really appreciate it.