Hi there,
Are you using a plugin to make the widget sticky?
If so edit this CSS in Additional CSS field:
.sidebar .widget:first-child {
background-color: #e86000;
color: #fff;
}
To this:
.sidebar .widget:first-child, .sidebar #nav_menu-3 {
background-color: #e86000;
color: #fff;
}
Then also add this:
.sidebar #nav_menu-3 a, .sidebar #nav_menu-3 .widget-title {
color: #ffffff;
}
For border:
.sidebar #nav_menu-3 a {
border-top: 1px solid #fff;
border-bottom: 1px solid #fff;
}