html,
body {
  margin: 0;
  height: 100%;
  background: #000;
  color: #fff;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding: 0 16px;
  box-sizing: border-box;
}

h1 {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 400;
  font-size: clamp(1.5rem, 5vw, 3rem);
  text-align: center;
}