body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}
nav {
    display: flex;
    justify-content: center;
    background: #444;
}
nav a {
    color: #fff;
    padding: 0.8rem;
    text-decoration: none;
}
nav a:hover {
    background: #555;
}
main {
    padding: 2rem;
    text-align: center;
}
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}