Reply To: primary nav bar

Yes, take a look on or around line 393 in your css file for this –

.menu li a:active,
.menu li a:hover,
.menu .current_page_item a,
.menu .current-cat a,
.menu .current-menu-item a {
background: #000;
color: #fff;
}

…..and then you can change your background to whatever color or image you want.