section {
    max-width: 768px;
    margin: 0 auto;
    padding: 20px;
}

section > h1 {
    font-size: 1.6em;
}

section > h2 {
    font-size: 1.3em;
}

section > h3 {
    font-size: 1.2em;
}

section p,
section ul {
    font-size: 1.1em;
    line-height: 1.5;
}