body {
	color: black;
	background:white;
	margin-left: 10%;
	margin-right:10%;
	max-width: 50em;
	font-family:  Optima, Times, Helvetica, Utopia, Palatino, serif;
}


p {
	text-indent: 0em;
	margin-top: 0.5em;
	margin-bottom: 0.5em
}

h1, h2, h3, h4 {
	font-family: Helvetica, Lucida, sans-serif;
}

tt, code {
	font-family: Monaco,  Courier, monospace;
}

div.note {
	color: black;
	background: silver;
    	padding: 0.5em;
    	border: none;
}

:link {
	color: blue;
	background: transparent;
}

:visited {
	color: purple;
	background: transparent;
}