How to change popup border color?

Hi.

How do you go about changing the border color of the popup box? I know it’s possible because some of my other extensions have a black border. I’m having trouble finding information on how to do this. I couldn’t identify the border with the inspector, and I tried the root html/body borders to no avail

Here’s a dark border with the BitWarden extension:
image

Here is the default white border on my extension that I want to change:
image

Thanks!

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As far as I know Firefox chooses the color automatically based on your page’s background color.