Wikia/mercury — pull request #376 by rogatty (2014-11-19 15:00:43+00:00)
Title: HG-355 Semi-transparency missing when side menu is open

https://wikia-inc.atlassian.net/browse/HG-355
This is quick fix that makes it less likely for side menu to get broken. It's not a perfect solution and it's still possible to see the defect. Side menu should be taken out from the site head.