IE10+ transform and position fixed problem

### BUG
In IE10+ the fixed elements such as header do not shift when the side bar is expanded. This is a bug in IE 10+ only and works fine in all browsers. You can reproduce this bug here http://codepen.io/miketierney/full/1d7ef66d650db41471532162b0b941af

### BUG FILED
The following bug has been filed and Microsoft has not fixed it since 2013 https://connect.microsoft.com/IE/feedback/details/806517/ie11-tramsform3d-and-position-fixed-problem