.centered, h1 { text-align: center; }
  p.identifier
  {
     text-align: right;
     margin-right: 40%;
  }
  pre { font-family:monospace; }
  .margins
  {
     { margin-left: 1em; margin-right: 1em; }   
  }
  code { font-family:monospace; color: red; }