Description

Trying to set a background color for the Post Template block in global styles has no effect due to some overly-specific styling in the block CSS.

That was added in #37941 as a workaround for global styles for the List block bleeding into any other block that uses a ul (the same problem stands un-worked-around in the Navigation block)

The sustainable solution here would be to add a classname to the List block so we can attach global styles to it without contaminating other blocks with lists in their markup. My suggestion is revisiting #12420. Cc @carolinan who did some work on it previously!

Step-by-step reproduction instructions

1. In global styles panel, under blocks > Post Template, try adding a background color.
2. Save and verify that it has no effect in the editor or in the front end.

Screenshots, screen recording, code snippet

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Environment info

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Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes