body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}
nav {
    background: #f0f0f0;
    padding: 10px;
    margin-bottom: 20px;
}
nav a {
    margin-right: 20px;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
.current {
    font-weight: bold;
}