Style Request: Dark Mode for Chrome Extension "Quick Tabs" drop-down menu

Here's its Chrome Web Store page:
I have seen that when you click most if not all Chrome Extension icons in the address bar that their menus display with white backgrounds. So I do not know if it is even possible to make an extension drop down display in dark mode. But this particular extension's OPTIONS page provides a CSS style window, but I just don't know how to use CSS to make a dark mode style.

(P.S. I tried to upload a screenshot to show the dropdown menu, but this forum software kept displaying error "Internal Error, could not move this file" )
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