Change background color on Single Post

Glad I could help :)

For any of you who want to change the colour of a single page only, try this:

/*change background colour of single page (outer frame)*/
body.page-id-#### {
background-color: #ffffff;
}

/*change background colour of single page (article on a single page)*/
.single.separate-containers .inside-article, .page-id-#### .inside-article {
background-color: #ffffff;
}

Thanks for sharing!