body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}
header {
    background-color: #222;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 24px;
}
nav {
    background-color: #444;
    text-align: center;
    padding: 10px;
}
nav a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    display: inline-block;
}
nav a:hover {
    background-color: #666;
}
.container {
    width: 80%;
    max-width: 800px;
    margin: 20px auto;
    background: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
}
footer {
    text-align: center;
    padding: 10px;
    background-color: #222;
    color: white;
    margin-top: 20px;
}