I don't mind the off-white — I don't love it either. Perhaps adding a border instead would help, and likely be a better solution than a background color.

I don't mind the off-white — I don't love it either. Perhaps adding a border instead would help, and likely be a better solution than a background color.

I agree. I'd lean toward a border myself.

Agreed — could we style it like our existing dropdown menus, like the block library or settings dropdown?

For now, I have styled as per the editor but I do think there's a fair point that it should have different styling as it is a different element. Also of note, the concept of having colour as the focus was good to explore over an explicit border. I have also to be consistent brought a border into the dark version.

New screenshots:

For the dark version, it might make sense to use a lighter border. So for the light version, there's a dark border (and I'd even suggest a little darker than what you have) and for the dark version, there's a light border. This helps ensure that the menu is noticeable across various color schemes.

@shaunandrews that darkness on the light is directly from the existing menu in the editor so I think keeping it as that makes sense for now. Same with the darker, I think to keep it dark works, rather than reversing the colourways.

Added an iteration on dark mode for @shaunandrews 🙌