Can anyone help me find something like this?
The colour for those links is set in your additional CSS for your theme. In particular, this section:
.menun li a:link{
color: #ccff00;
text-decoration: none;
padding-bottom: 2px;
}
.menun li a:visited {
color: #ccff00;
text-decoration: none;
}
.menun li a:hover {
color: #FFFF00;
border-bottom-width: 2px;
border-bottom-style: solid;
border-bottom-color: #FFFF00;
}