body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline-block;
    position: relative;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    display: block;
    padding: 10px;
    text-align: center;
}

nav ul li:hover {
    background-color: #555;
}

nav ul li ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #333;
    padding: 0;
    min-width: 150px;
}

nav ul li:hover ul {
    display: block;
}

nav ul li ul li {
    display: block;
}

main {
    padding: 20px;
    text-align: center;
}

footer {
    background-color: #333;
    color: white;
    padding: 10px;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
}