flag scrollen nur im fenster

flag.js

@@ -18,12 +18,14 @@
       flag.style.opacity = 0;
       setTimeout(function() {
         flag.remove();
+        document.body.style.overflowY = 'auto';
       },500);
     },3000);
   }
 
   var openFlag = function(ev) {
     flag = document.createElement('div');
+    document.body.style.overflowY = 'hidden';
     flag.id = 'flag-overlay';
     iframe = document.createElement('iframe');
     iframe.src= '';