Board Thread:Support Requests - Designing Your Wiki/@comment-31595297-20171219160131/@comment-9605025-20171219185804

The background image size can be anything you want. Just be aware that how it displays will depend on each visitor's view window. For future reference 1 GB = 1,024 MB and 1 MB = 1,024 KB. Therefore, the original image with file size 3.77 MB is 3,860 KB (about 13 times the max allowed size) or 0.00368 GB.