body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f2f2f2;
}

header {
    background: #222;
    color: #fff;
    padding: 20px;
    text-align: center;
}

nav {
    display: flex;
    justify-content: center;
    background: #333;
}

nav a {
    color: white;
    padding: 15px 20px;
    text-decoration: none;
    display: block;
}

nav a:hover {
    background: #555;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}