Fix display corruption on IE

Remove javascript added in #223 which is unnecessary

Damn, the javascript I just removed *IS required by firefox

Overflow hidden was added to #main on pull #191, this change makes that redundant, also fixed minor CSS problem on clouds theme that was introduced with this change and removed redundant css on FAB and minimal themes
Merge pull request #225 from ddrury/SidebarCSSfix

Fix display corruption on IE