body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 50px;
}

header {
    background-color: #f0f0f0;
    padding: 20px;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

footer {
    background-color: #f0f0f0;
    padding: 20px;
}