body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}
header {
    background: #222;
    color: #fff;
    padding: 20px;
    text-align: center;
}
main {
    padding: 20px;
}
section {
    margin-bottom: 20px;
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
footer {
    text-align: center;
    padding: 10px;
    background: #222;
    color: white;
}