Sorry, that's because of the redesign of the site. I didn't like the white bar so asked the designer to change it to a dark color that matches with the style of the wiki, but Wikia doesn't have an option to preview the changes so she need to do them on the live site. It is still not finished so some things doesn't have a desirable appearance yet.
During the next days or weeks some things could change in the same way until the redesign is completed. Sorry in advance for the inconveniences this may cause, we will try to make it as less annoying as possible.