How can I change the font color of this page to gray？

How can I change the font color of this page to gray

I need to change the black background of a category page to a white background, but I found that the corresponding color of this page is white. When I changed the background, I could not see the words directly. I need help

1, How to adjust the color of this page to gray or black

2. After adjusting the color of this page, will it affect the color display of other pages?

Specific instructions are shown below

Hi admin-6357,

Thanks for reaching to us and appreciate your patience.

To assist you in the best possible manner, I kindly ask that you please provide me temporary wp-admin info (wp-admin URL, username, password) and screenshots that illustrate the problem to the Private Content area, this will allow me to thoroughly investigate and address your concerns more efficiently.

Regards,

[Author]

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