html,
body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: #fff;
  color: #111;
}

main {
  max-width: 600px;
  margin: 10vh auto;
  padding: 0 1rem;
  text-align: center;
  line-height: 1.4;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
}