Somebody PLEASE HELP ME--CSS black box glitch!

I thought it was IE, now I'm just irate, confused, and at the end of my rope. My homepage will be this:

www.pdmdigital.com/newindex.htm

Then click on the 'Web Design' link. The top of that page has a black box where the links should be (or will once to click them, try it). This page has the EXACT (copied and pasted) CSS as the first. I am at a complete loss. Please, please help me, theMind-

You have:

.fun a:link, a:visited {
display: block;
text-decoration: none;
background-color: #000000;
color: #000000;
}


instead of:

.fun a:link, .fun a:visited {
display: block;
text-decoration: none;
background-color: #000000;
color: #000000;
}

Hence the black background, since it is lower in your CSS than topnav.