Page Background Images

If your theme uses the body_class() function then each page should have a unique class such as possibly ‘page-id-6’.

You can then use that class in your style.css file to assign a background, for example:

.page-id-6 {
  background: transparent url(images/your-image-file) repeat 0 0;
}

If you theme does not use the body_class() functions it is easily added, and if you are looking for more information about the function here is a bit of reading: https://www.nathanrice.net/blog/wordpress-2-8-and-the-body_class-function/

Cais,
Here is a WP site I’m building https://sub.whoopdesign.com/

I followed your advice as per above for trying to change the background image on just this page https://sub.whoopdesign.com/?page_id=28 but instead I get just a blank background.

Could you advise me on what else I need to do.

Your image isn’t being found.

Ok, I put in the full url filepath and it works now, but shouldn’t it just be able to locate the image using the “images/your_image_file” structure?

…shouldn’t it just be able to locate the image using the “images/your_image_file” structure?

It depends. From inside the stylesheet that works just fine. From most other places in WordPress relative URLs don’t work.