html {
  background: radial-gradient(#111, #1d1d1d);
  font-size: 20px;
}
body {
  height: 100vh;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #eee;
}
h1 {
  font-size: 2rem;
}