Kode lengkap styles.css cara membuat dropdown dengan html

styles.css

nav a:hover {
    text-decoration: none;
}
nav ul {
    list-style: none;
}
nav ul li {
    float: left;
    padding: 5px 20px;
}
nav ul li:hover {
    background-color: #2980b9;
}
nav ul li ul {
    display: none;
    list-style: none;
    margin-left: -20px;
}
nav ul li ul li {
    float: none;
    padding: 5px 20px;
    margin-left: -40px;
}
nav ul li ul li:hover {
    background-color: #2980b9;
}
nav ul li:hover > ul {
    display: block;
    position: absolute;
    background: #ddd;
}
nav ul li:hover > a {
    color: #fff;
}