html,
body {
  padding: 0;
  margin: 0;
  min-height: 100vh;
  min-width: 100vw;
}

main {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

main h1 {
  font-size: 6rem;
}