h1 {
  color: blue;
  text-align: center;
  font-size: 8em;
}
h2 {
  color: brown;
  text-align: center;
  font-size: 6em;
  background-color: teal;
}
h3 {
  font-size: 4em;
  text-align: center;
  color: thistle;
  background-color: brown;
}