doc/DocBook/docbook.css

body {
	font-family:		sans-serif;
}

.programlisting {
	font-family:		monospace;
	font-size:		1em;
	display:		block;
	padding:		10px;
	border:			1px solid #aaa;
	color:			#000;
	background-color:	#eee;
	overflow:		auto;
	margin:			1em 0em;
	border-radius:		6px;
}