XF 1.5 XenForo Background Image Page Height Issue

[SpaceCowboy]

I'm having an issues where the repeating background image only extends about half way down the page before it stops. I have set the background image in the Style Properties: General menu and tried to adjust the max-height: attribute which still wouldn't make the background span the page height. Any suggestions? My URL is http://mymopar.com/forum/index.php

Thanks,
SpaceCowboy