For the plugin’s popup menu, use an acrylic background.

[Shomnipotence]

• The plug-in's pop-up menu must be transparent first (background = "transparent" )

• Based on this, its background is provided by acrylic.

• Since Chromium natively supports "smart invert colors", inverting colors requires no extra work and works just fine whether in dark or light mode.

Once these three points are met, the plug-in's pop-up menu will conform to the design diagram.

You can freely choose whether to align the buttons left or right - menu