ul.nav-sub {
    position: absolute;
    background: #50718a;
    z-index: 999;
    width: 128px;
    text-align: center;
    display: none;}

ul.nav-sub li{
    width: 128px;}
ul.nav-sub li:hover {
    background:#d8454a;
    border:none;
    width: 128px;}

.menu3 li:hover{background:#d8454a;}

.menu3 ul li:hover .nav-sub{display:block;}