body {
    font-family: Arial, sans-serif;
    margin: 0;
    text-align: center;
    background: #f5f5f5;
}

header {
    background: #1f2937;
    color: white;
    padding: 60px 20px;
}

main {
    padding: 40px 20px;
}

section {
    max-width: 800px;
    margin: auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
}

footer {
    margin-top: 40px;
    padding: 20px;
    color: #666;
}