How to check for broken CSS images
You can find broken images in a style sheet by walking through all links in the style sheet one by one and checking in the server if the file is still there. Another way is to check the 404 error log of the server to see whether graphic files that no longer exist are still being requested.
The easiest and most efficient way is to place the style sheet address in an automatic tool. The automatic tool asks for all links in the style sheet, then it checks whether the images are still being loaded.
You can visit csscheckimages.com and type in the style sheet address.