.menu-item:last-child {
    border-right: none !important;
}

.gm-main-menu-wrapper .gm-navbar-nav > li{
    border-right: 1px solid #f00;
    height: 44px;
    margin: 2px 0;
}

.gm-main-menu-wrapper .gm-navbar-nav > li:last-child {
   border-right: none;
}