body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #3b7a57;
    color: white;
    padding: 40px;
    text-align: center;
}

section {
    padding: 40px;
    max-width: 800px;
    margin: auto;
}

footer {
    background-color: #222;
    color: white;
    text-align: center;
    padding: 20px;
}