body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.6;
}

a {
  color: #0366d6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  line-height: 1.25;
}