Stop using position="fixed". For visually-impaired users (like me) who've increased the font size, it means that when the left navbar overflows the screen you can't see the rest of it by scrolling. Test this out with Ctrl-<PLUS> in Firefox to see what I mean.

I get that it's useful for most people, though, so I'm happy to have it be the default, with a checkbox to turn it off or something.