Top bar background color

It seems that the background color of top bar (Toggle sidebar, Toggle note list, New note, etc) is using the same background color as the note list and note editor. Is there any way to change the color of the top bar separately from other elements, or can this be added?

I am creating Breeze and Breeze Dark themes for Joplin, so the application looks consistent with the KDE desktop. Ideally the top bar should have a different background color like this vscode theme:

or the file explorer:

Instead, it has to look like this:

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