Board Thread:Support Requests - Designing Your Wiki/@comment-44745594-20200614055043/@comment-9605025-20200614063729

All 3 of those wikis are behaving identical for me. So I am not sure what issue you are having. FYI, for legacy wikis, you shouldn't need CSS to accomplish this. As long as your image is at least 2000px wide, you should get the "no-split" option in ThemeDesigner. This will make the width of the image adjust to the width of the user's window. Regardless of the width issue, there should be a "fix" option which will set the background attachment to what you are currently doing via CSS.