Merge branch 'feature/jschatz1/sidebar-sizing' into 'master'
Sidebar overlaps content when screen is below 1200px. When screen is below 1200px, the sidebar overlaps. When screen is above 1200px, the sidebar pushes content out. z-index change to make sure hamburger stays on top. Fixes #12717 ![screensize](/uploads/9a21fa06d583a49d6ebbf1ada34c6792/screensize.gif) ![screensize-small](/uploads/7c25f46e962248a40840562a01c83f8f/screensize-small.gif) Also sorry I couldn't get the collapse button in the screen cap. It's there. See merge request !2620
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