Admin Forum:Infobox css problem

Infobox Template
When I try to use the infoboxes like this one, I dont get that grey colouring. Can someone tell me how to get that? I think I need to copy the css too. But which and to where? — ¤ U LTIMATE S UPREME ¤ (T@lk) 11:00, June 20, 2012 (UTC)
 * The box has a load of class calls. These classes may have style settings in MediaWiki:Wikia.css.--PedroM 12:02, June 20, 2012 (UTC)
 * I think Anime-box.css and the Anime-Content.css. But where? — ¤ U LTIMATE S UPREME ¤ (T@lk) 12:11, June 20, 2012 (UTC)