I used the Page Settings>Advanced Settings>Page Stylesheet to point to a stylesheet for a single page on my site and it crashed the page earning me a:
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

The stylesheet simply has:
body {
background: white;
}
and is located in the portal-0 folder on the site.
I am sure I will have to recreate the page, but I want to know how to have this single page show a different background than the rest of the site.