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

header {
    background-color: #1f2933;
    color: white;
    padding: 40px 20px;
    text-align: center;
}

main {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #e5e7eb;
    font-size: 0.9em;
}