body {
  margin: 0;
  background: #fff;
  color: #000;
  font: 1rem / 1.5 system-ui, sans-serif;
}

main {
  box-sizing: border-box;
  display: grid;
  min-block-size: 100vh;
  min-block-size: 100dvh;
  padding: 1rem;
  place-items: center;
  text-align: center;
}

h1 {
  margin: 0;
  font: inherit;
}