body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
    color: #333;
}
header {
    background: #004466;
    color: white;
    padding: 20px;
    text-align: center;
}
main {
    padding: 20px;
}
section {
    margin-bottom: 30px;
}
footer {
    text-align: center;
    padding: 10px;
    background: #ddd;
}