The business theme has a monochrome grey/white background showing a plant. Usually the grey is as large as the content, but this is not the case for some wiki pages in branch 15.x as of r60042, as can be seen in the attached screenshot. This can be trivially reproduced with the "Test" page created by the collaborative community profile, or with a page which simply contains "foo".
While this may have no functional impact, I consider the impact on the look as a show-stopper. The icons top right (such as for editing) can display outside the background.
This would not happen in 12.x. This persists in trunk. It happens in 2 browsers on 2 tested (Iceweasel and Chromium).
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