body {
    font-family: Arial, Helvetica Neue, Helvetica, sans-serif;
    margin: 40px auto;
    max-width: 960px;
    line-height: 1.6;
    font-size: 18px;
    padding: 0 10px;
    color: #444;
}

h1, h2, h3 {
    line-height: 1.2;
}