Are you trying to resolve an image from to absolute path?
Try using a relative path
background:url(../../path/to/img.png) 0 0 no-repeat; (or whatever depth)
Or try formatting the absolute path like this
background:url(/path/to/img.png) 0 0 no-repeat; (this is resolved from the root, thanks to that / at the front – you don’t need to specify domain)
To offer any further help, we’d need to see the full declaration for that line of CSS.