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

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

nav a {
    margin: 0 15px;
    color: #fff;
    text-decoration: none;
}

main {
    padding: 20px;
}

h2 {
    color: #333;
}