body {
	font-family: Arial, Helvetica, sans-serif;
	background-color:#F0F0F0;
}
.mainbody {
	max-width: 800px;
	margin: auto;
	border: #000 solid 3px;
	padding: 20px;
}
p a {
	font-weight:bold;	
}
.code {
    display: block;
    font-family: monospace;
	padding: 10px;
	background-color:rgba(0, 0, 0, 0.9);
	color:#6F0;
	overflow:scroll;
	overflow:auto;
	counter-reset: line;
}
.code code:before{
	border-right: 1px solid #888;
	padding: 0 10px;
	margin-right: 15px;
	color: #888;
	-webkit-user-select: none;
	min-width:15px;
	text-align:right;
	display:inline-block;
}
.code code {
	counter-increment: line;
    white-space: pre;
	display:block;
}

.count code:before{
	content: "" counter(line);
}