html {
  font-family: 'Courier New', Courier, monospace;
}

h1 {
  text-align: center;
  background-color: grey;
}

h2, h3 {
  text-align: left;
  margin-left: 10%;
  margin-right: 10%;
}

h4 {
  text-align: left;
  margin-left: 10%;
  margin-right: 10%;
  font-size: 25px;
}