There is a whitish background image behind the link:

stylesheet.css, line 562:
Code:
#navBreadCrumb a {
    background: url("../images/breadcrumbs_bg.gif") repeat scroll right 0 transparent;
    color: #767676;
    margin-right: 4px;
    padding: 2px 11px 2px 5px;
    text-decoration: none;
}