Update purejs_onepage_scroll_demo.html

Author: peachananr

demo/purejs_onepage_scroll_demo.html

@@ -670,6 +670,15 @@ <h2>You can customize the animation timing, the selector or even the animation e
      responsiveFallback: false
    });
 
-	</script>
+	</script><!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-11278966-3"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-11278966-3');
+</script>
+
 </body>
 </html>