body {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 20px;

    font-family: Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;

    color: #222;
}


header {
    margin-bottom: 30px;
}


header h1 {
    margin-bottom: 0;
}


header p {
    margin-top: 0;
    color: #666;
}


nav {
    margin-bottom: 50px;
}


nav a {
    margin-right: 15px;
}


section {
    margin-bottom: 50px;
}


h2 {
    margin-bottom: 15px;
}


h3 {
    margin-bottom: 5px;
}


a {
    color: #0645ad;
    text-decoration: none;
}


a:hover {
    text-decoration: underline;
}