body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    padding: 0;
}

/* Top navigation bar */
.navbar {
    background: #f4f4f4;
    padding: 10px;
    border-bottom: 1px solid #ddd;
}

.navbar a {
    margin-right: 15px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.navbar a:hover {
    text-decoration: underline;
}

main {
    padding: 20px;
}