body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
    background-color: #f4f4f4;
}
header {
    background: #333;
    color: white;
    padding: 20px;
}
section {
    padding: 20px;
}
.container {
    max-width: 800px;
    margin: auto;
    background: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
footer {
    background: #333;
    color: white;
    padding: 10px;
    position: fixed;
    width: 100%;
    bottom: 0;
}