changing the background color

I would first go to appearance > background (or maybe it’s called headers, I forget) and see if you can change the background there.

hi thanks, but I am afraid I need to edit the code because I have to add an image as background and then change the x’s and y’s
Anyway I can do that in the css?
thanks

https://www.w3schools.com/css/css_background.asp

what is the problem?

if you don’t want to or cannot use the apperance – background options:
have you tried adding the background style into style.css of the child theme?

what was the result?

possibly, you might need to add !important to force the style; example: background: white !important;

just in case: https://www.w3schools.com/css/css_background.asp

edit: now you have the link twice;
btw: I recommend the whole w3school.com if you need to improve any skills…

thanks all, I sorted this out. I added this to my child css:

html body {background:url('https://andys.antonioborrillo.co.uk/wp/wp-content/themes/twentyeleven-child/images/grey_back.jpg') repeat;
}

and worked a treat
thanks