body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
}

main {
    padding: 2rem;
}

footer {
    text-align: center;
    background: #333;
    color: #fff;
    padding: 1rem 0;
}