body {
  background-color: black;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
  margin: 0;
  padding: 0;
  text-align: center;
}
h1, h2, h3, h4, h5, h6 {
  margin: 0.5em;
  font-weight: normal;
}
span {
  font-family: monospace;
}