css: rework a bit the footer to use dark background and light foreground
css: avoid spurious horizontal bar
css: fix "nowrap" typing
css: fix small scrollbars for code (compatibility with cssutils)
css: remove unneeded LESS functions

When a function is only using one rule, let's remove the
function. Also, we remove the IE7 hack for `inline-block`, it doesn't
work with cssutils and we don't really want to support IE7 anymore...
ie6-7: use IE8.js for IE6/7 compatibility