Those are links, so concentrate on these (although there could be other places those are defined).
Code:
a:link, #navEZPagesTOC ul li a {
color: #000000;
text-decoration: none;
font-weight: bold;
}
a:visited {
color: #000000;
text-decoration: none;
font-weight: bold;
}
a:hover, #navEZPagesTOC ul li a:hover, #navMain ul li a:hover, #navSupp ul li a:hover, #navCatTabs ul li a:hover {
color: #854401;
background: #CCFF66;
font-weight: bold;
}
a:active {
color: #854401;
font-weight: bold;
}
If you don't have it, get the Firefox browser with the web developer add on which allows you to tinker with the stylesheet on the fly and see the results immediately. To make the changes permanent, you have to save the stylesheet separately and upload it to your site.
If you are editing files, I sincerely hope you're using the override system or all your changes will be lost with the next upgrade/update.