slight tweak to pdf export css (#92)

css/print-pdf.css

@@ -23,6 +23,7 @@ body {
 	padding: 0;
 	float: none !important;
 	overflow: visible;
+	background: #333;
 }
 
 html {
@@ -110,6 +111,7 @@ ul, ol, div, p {
 	position: static;
 	width: 100%;
 	height: auto;
+	min-height: initial;
 	display: block;
 	overflow: visible;
 

index.html

@@ -332,7 +332,7 @@ function linkify( selector ) {
 			// Load the scripts and, when completed, initialize reveal.js
 			head.js.apply( null, scripts );
 			
-		</script>x
+		</script>
 
 	</body>
 </html>