Never mind it does work. :)

Woot! XD I envy you. I cant seem to get it to work, I must be overlooking something simple.

As Fandyllic posted :)

I put it in http://enteryourwikiaurlhere/wiki/Special:MyPage/wikia.css and when I go to the page I wrote down in MyPage/wikia.css.

You will need to bypass your browser's cache and wait a bit before though.

Yeah, sometimes it takes awhile for it to start working... Wikia has a huge image caching thing going on in the background and it sometimes doesn't deliver the image immediately. After it starts working it should be good, but if you change the referenced image you may have to wait again.

okay, I'll just leave it for the moment and see if it takes effect. But it's been half an hour since I put it in, so here's hoping :P

Another tip... If you go to a page like File:Flame_Dawn_Background.jpg, you can click on the image and it will give you a URL like: http://img4.wikia.nocookie.net/__cb20140821202731/infinity-wars/images/a/a9/Flame_Dawn_Background.jpg

You can use this URL, but if you update the image, it will not reflect that latest image at File:Flame_Dawn_Background.jpg, so that is why I suggested http://images.wikia.com/infinity-wars/images/a/a9/Flame_Dawn_Background.jpg which has changes to the URL you can figure out with most Wikia images. It should refer to the latest version.

okay, thank you :)

Lastly,

I put it into the admin CSS section of the wiki

http://infinity-wars.wikia.com/wiki/Special:CSS

That would work okay?

sorry for spamming this thread :P (This is the final question XD)

That should work or w:c:infinity-wars:MediaWiki:Wikia.css.

perfect! thank you for your help!