html, body {
  height: 100%;
  margin: 0;
}

body {
  display: grid;
  place-items: center;
  background-color: #000;
  color: #fff;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  text-align: center;
}

.message {
  font-size: 1.2rem;
}