Board Thread:Support Requests - Designing Your Wiki/@comment-4109966-20191214213440/@comment-168424-20191214215512

.WikiaSiteWrapper { background-image:url("IMAGE_URL"); background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-position: center; }

If you're trying to get around the file size limitation, that's fine, but it is there for a reason... too big an image will slow down your wiki.