Board Thread:Support Requests - Designing Your Wiki/@comment-34259504-20200415070919/@comment-9605025-20200415172341

What do you mean by "filled"? Do you mean you want a single copy of the image to cover the whole background? And just to clarify, you are looking to change it from the current background to the one you posted here?

As stated on Help:Background, the image must be at least 2000px wide in order to cover the entire width without tiling and without the vertical color break. I have uploaded a new version of your image that meets this requirement.

Using the "fix" option makes it so that the background doesn't move when the page is scrolled. If you don't fix the image, then it will be tiled vertically even if it completely fills the width of the page.