#nav {
    margin: 0;
    padding: 0;
    display: flex;
}
#nav li {
    list-style: none;
    width: 200px;
    height: 40px;
    background: #fff;
    text-align: center;
    font-size: 14px;
    line-height: 2.8;
    border-right: 1px solid #eee;
    color:darkgray;
}
#nav li a {
    text-decoration: none;
    color: #000;
}

#nav li ul {
    display: none;
    margin-left: -40px;
    position: absolute;
}
#nav li ul li {
    border-top: 1px solid #eee;
}