body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f5f5f5;
    color: #333;
}

header {
    background: #222;
    color: #fff;
    padding: 20px;
    text-align: center;
}

main {
    padding: 30px;
}

footer {
    text-align: center;
    padding: 20px;
    font-size: 14px;
    color: #888;
}