body { background-color: #ffffee; 
    margin: 1em 3em;
    font-family: serif;
    font-size: 14pt;
}
h1, h2, h3 { font-family: sans-serif;}
h1 { font-size: 300%; }
h2 { font-size: 200%; }
h3 { font-size: 100%; }
pre { border: 1px solid gray; padding: 1em;}
img { border: 1px solid black; padding: 0em; margin: 1em;}

