body { 
    margin-left: 10%; 
    margin-right: 10%; 
    font-family: sans-serif;
  }
  h2,h3,h4,h5,h6 { margin-left: -3% }
  pre {
     color: green; font-weight: bold;
     white-space: pre; font-family: monospace;
  }
  em { font-style: italic; font-weight: bold }
  strong { text-transform: uppercase; font-weight: bold }
  .navbar {text-align: center }