body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #fff;
  color: #1a1a1a;
}
main {
  max-width: 28rem;
  margin: 20vh auto 0;
  padding: 0 16px;
  text-align: center;
}