css vertical nav border format

                                          li:first-child {
    border-top: none;
}
     li:last-child {
    border-bottom: none;
}
ul {
    width: 200px;
    background: #292929;
    color: white;
    list-style: none;
    padding-left: 0;
}
 li {
    padding: 10px;
    border-bottom: 1px solid black;
    border-top: 1px solid #3c3c3c;
}