body {
  max-width: 700px;
  margin: 40px auto;
  padding: 0 20px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.5;
  color: #222;
}

pre {
  overflow-x: auto;
  background: #f5f5f5;
  padding: 10px;
}

a {
  color: #0645ad;
}