BODY {
  text-align: justify;
  text-indent: 1em;
}

H1 {
  text-align: center;
  font-family: sans-serif;
  font-size: large;
  color: black;
}

H2 {
  font-family: sans-serif;
  text-align: center;
  font-size: medium;
  color: black;
}

H3 {
  text-align: center;
  font-family: sans-serif;
  font-size: small;
  color: blue;
}

H4 {
  font-family: sans-serif;
  font-size: small;
  text-align: center;
  color: black;
}