converse.js/docs/source/_static/api.css

body {
  font-size: 1.2rem;
}

.brand-heading {
  display: flex;
}

.brand-heading__text {
  font-size: 6rem;
  margin-left: 1rem;
  margin-top: -1rem;
}

.subdued {
  color: darkgray;
}

.byline {
  font-size: 30%;
  margin-top: 0;
}

h2 {
  font-size: 45px;
}

h3 {
  font-size: 35px;
}

h4 {
  font-size: 30px;
  margin-top: 40px;
}

p {
  font-size: 1.3rem;
}

.details {
  margin-bottom: 20px;
}

.prettyprint code {
  padding: 8px 12px;
  font-family: courier;
}