Add image to background for one page

Site URL: https://www.narf.org.uk

Hi,

I wondered if there is a way to add a pattern (it's an image) to the background of just one page? We are using the Mojave theme. 

I've attached the png I would like to use as the background (not sure if it's the right size, I was going to experiment when adding it) but I would like to repeat rather than stretch. 

I am graphic designer, but far from a coder I'm afraid. We would like to be able to add the brand patterns subtly to the whole background on some of the individual pages. 

Thanks

Instructions are here, look for Brine Family which includes your template. You will need to upload the image you want to use to the custom css file manager in your site. That url goes where the url is in the instructions. 

https://beaverhero.com/squarespace-background-image/

Background cover header + Footer + Page content

Or Page Content only?