body{
  margin: 2em;
  background: #e0ffe0;
  color: black;
}

h1{
  text-align: center;
  color: green;
  margin: 1ex 0;
}
h2{
  padding-left: 10px;
  color: green;
  margin: 1ex 0;
}
h3{
  padding-left: 10px;
  color: green;
  margin: 1ex 0;
}
h4{
  padding-left: 1em;
  color: green;
  margin: 1ex 0;
}

cite{
  display: block;
  //margin: 0em 3em 0em 3em;
  padding-left: 3em;
  color: darkred;
  background: yellow;
}

p{
  //background: yellow;
  text-align: justify;
}

pre{
  margin: 0em 3em 0em 3em;
  color: red;
  background: white;
}