body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: #fff;
    padding: 15px;
    text-align: center;
}

nav a {
    margin: 0 10px;
    color: #333;
    text-decoration: none;
    font-weight: bold;
}

nav {
    background: #ddd;
    padding: 10px;
    text-align: center;
}

.container {
    padding: 20px;
}