User blog comment:BertH/Layout and navigation updates coming October 3/@comment-188432-20121003164001/@comment-957747-20121003182515

We would encourage that you'd alter the background so that it works with that space. The trend lately with wikis is to use a background that can be seen through the new transparency. For Tardis, and other wikis that use a 'shell' to create a background, this causes slight issues.

You can add a solid background color (that matches the background that should be there) to #WikiaTopAds. For Tardis, that would be

Please be advised: the ads were separated from the skin in this manner to draw a distinction on what is ad space and what is wiki content space. Changing the background of that area would essentially be the same as uploading a new image with that entire area filled with the solid color you choose.