How can I modify the colors of my theme for a single section of my site? [closed]

Is it a custom written theme or did you buy it ? If your using a paid or some kind of pre wriiten theme. you can set child theme and can overwrite the css using template class or some kind of specific identifier.

Here how create a child theme,
https://codex.wordpress.org/Child_Themes

This is the wordpress codex doc, I think no need to put codes here.

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