2017-05-24, 19:23:53
You have to set the background picture in your theme instead of your page. If it is only suposed to be active on one page, you can make a seperate template file, in the page edit screen you can set a different template per page.
There are other ways (custom field/component etc.), but this is the standard way I think.
There are other ways (custom field/component etc.), but this is the standard way I think.