html, body {
  flex-direction: column;
  height: 100%;
  justify-content: center;
  margin: 0;
  padding: 0;
  width: 100%;
  background-color: #000;
  color: #fff;
}

html, body, div {
  display: flex;
}

body {
  align-items: center;
}

#content {
  font-family: 'Courier New', Courier, monospace;
  font-size: 6vw;
}