MediaWiki:Common.css
From Guestbook
Note: After saving, you may have to bypass your browser's cache to see the changes. Mozilla / Firefox / Safari: hold down Shift while clicking Reload, or press Ctrl-Shift-R (Cmd-Shift-R on Apple Mac); IE: hold Ctrl while clicking Refresh, or press Ctrl-F5; Konqueror:: simply click the Reload button, or press F5; Opera users may need to completely clear their cache in Tools→Preferences.
/* edit this file to customize the all skins for the entire site */ #p-logo a { background-image: url('http://www.editthis.info/images/guestbook/1/14/Guestbook.PNG ') ! important; background-position: top left; background-repeat: no-repeat; }