body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #24292f;
  background: #f6f8fa;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 24px;
}

h1 {
  margin: 0 0 16px;
  font-size: 28px;
  font-weight: 600;
}

p {
  margin: 0 0 14px;
  line-height: 1.55;
}

a {
  color: #0969da;
}