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Subnav white background adjustment #18976
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.
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.