Hello,
That is part of the CSS below. The line is generated from the bottom border CSS call.
Template.CSS - Line 720
.module_round_box_outer ul.menu li a, #s5_bottom_row3 .module_round_box_outer ul li a, .module_round_box_outer ul.menu li span {
border-bottom: 1px solid #f3f2f2;
color: #717171;
display: block;
margin-bottom: 4px;
padding-bottom: 4px;
}
-Mike