div.source{
	display: inline-block;
	position: relative;
	border: 1px dashed black;
	padding: 0px .5em;
	border-radius: .5em;
	background: #fff;
	box-shadow: 2px 2px 2px rgba(0,0,0,0.5);
}
div.source div.float{
	position: absolute;
	display: none;
	left: -15em;
	top: -1em;
	margin: 2em;
}
div.source div.float pre{
	overflow: auto;
	width: 32em;
	height: 15em;
	text-align: left;
	background: #fff;
	padding: 1em;
	border: 1px solid silver;
	box-shadow: 5px 5px 5px rgba(0,0,0,.5);
	font-size: 1.2em;
	font-weight: normal;
}

div.source:hover div.float{
	display: block;
}