How to colorize the bottom of the page

I want to ask that the parts at the bottom of the page that I circled are always gray, not black. Where should I adjust the color so that these parts can be black? Thank you very much.

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Hello,

Please navigate to the Theme Settings >> Style & Color >> Pages Background >> Set the color for all pages background: https://ibb.co/5WS0np5

Best Regards.

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