Fix incorrect body size

examples/misc_controls_trackball.html

@@ -5,7 +5,7 @@
 		<meta charset="utf-8">
 		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
 		<style>
-			html {
+			html, body {
 				width: 100%;
 				height: 100%;
 				overflow: hidden;