PROBLEM "current" navigation

[Artur]

Hi.

How can I set up the "current" navigation class to be shown? I am working on this theme - http://base.kingarchee.pl/getsimple/demos/Azure/ - and I am not able to make current navigation element shown with dark background.

I have this as a code for current:

Code:

#menu a:hover, #menu li.current {
    text-decoration: none;
}

#menu li.current {
    background: #008C9A;
}

And it doesn't work. How can I fix it?