wordpress how to change a background color only on pages

Theme options > advanced styling, main content background

Kadence Themes

Thank you for your promt support,
Actually, i would like to change only the page area that there is text, content (like term of use page)

You would have to do this with css, using the page specific body class. Would look something like this:

body.page-id-6 .contentclass {
background:#eee;
}

Kadence Themes