* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: grid;
  place-items: center;
  place-content: center;
  min-block-size: 100vh;
  font-family: system-ui, sans-serif;
}

h1.container {
  inline-size: 100vw;
  font-size: 30vmin;
  text-align: center;
  margin: 0;
}