design.css

nav ul{
    float: left;
}

nav ul li{
    float: left;
    list-style: none;
    position: relative;
}

nav ul li a{
    display: block;
    font-family:arial;
    color: white;
    font-size: 15px;
    padding: 4px 8px;
    text-decoration: none;
}

nav ul li ul{
    text-align: left;
    display: none;
    position: absolute;
    border-radius: 0px 0px 5px 5px;
    padding: 10px;
}

nav ul li:hover{
    text-decoration:none;
    border-bottom: 3px solid red;
}

nav ul li:hover ul{
    display: block;
    z-index: 9999;
}

nav ul li ul li{
    width: 110px;
}

nav ul li ul li a{
    padding: 8px 14px;
}

nav ul li ul li a:hover{
    text-decoration:none;
    border-bottom: 0px solid red;
}