Spotlight v11.0 Non-Homepage (product, cart, etc.) background color change and fonts customization

Store Design
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1

Why can’t you customize pretty much anything in the Spotlight V11.0 on a Non-Homepage pages like Product Page, Collection Page, Cart Page, About Us Page, Terms Page etc.?

I tried a few CSS codes but didn’t help.

2

Here’s a link to the the preview page:
https://69gqzjwu8v6xoybu-10506946.shopifypreview.com