Ask about color correction in the all pages background section

I want to ask what part of the page is the color editing in the all pages background section effective? Because after editing, I don’t see any color change on the page. Thank you very much

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Hello,

This color will apply on the page background like this: https://ibb.co/23RkZZY The Red color I have set for my site.

Best Regards.

[Author]

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