body {
  background: #ffffff;
  color: #222222;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.5;
}

main {
  max-width: 640px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.1rem;
  margin-top: 2.5rem;
  margin-bottom: 0.5rem;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

li {
  margin-bottom: 0.4rem;
}

a {
  color: #222222;
}

a:hover {
  color: #666666;
}