diff --git a/app/public/index.html b/app/public/index.html
index b139c53..769621b 100644
--- a/app/public/index.html
+++ b/app/public/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <meta charset="utf-8" />
@@ -12,6 +12,18 @@
     <link rel="stylesheet" href="/build/bundle.css" />
 
     <script defer src="/build/bundle.js"></script>
+
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-H6FRFM049K"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag() {
+        dataLayer.push(arguments);
+      }
+      gtag("js", new Date());
+
+      gtag("config", "G-H6FRFM049K");
+    </script>
   </head>
 
   <body></body>
