added view port

Author: Jinhua Wang

js/index.js

@@ -1,6 +1,14 @@
+ document.addEventListener('touchmove', function(event) {
+    event = event.originalEvent || event;
+    if(event.scale > 1) {
+      event.preventDefault();
+    }
+  }, false);
+
 $(document).ready(function() {
 
 			$('#button').click(function(){
 				$('body').toggleClass('day');  
 			});
+
 		});