How to change/put background-image on opencart website?

Question

css

Hello, the situation is this:
I can’t change the background of the site. it's a little non-standard made (Not mine) I'm
not strong in website programming
All guides often change in /body and are shown when hovering over the normal /body background. I change there - nothing. I have /body.common-home which I just can't find.
The problem is short: I can't put a picture with the name fon.png, although the code for it is already there

Answer 1

it is not clear what the problem is, for the bodygiven background-colorone that needs to be changed, so change it.