Sidebar content out of container

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http://stackoverflow.com – I have a problem with the Google nexus 7 tab. I have an hidden sidebar which slide to the left when opened. When opened, we can see the content of the sidebar is out of the container (see the picture), but when I close and open again, the content is well placed. http://i.stack.imgur.com/3AMOY.jpg Any idea please ? Thanks (HowTos)