diff --git a/docs/custom_theme/main.html b/docs/custom_theme/main.html
new file mode 100644
index 0000000000..b6ad2467dd
--- /dev/null
+++ b/docs/custom_theme/main.html
@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+
+{% block analytics %}
+  <!-- Global site tag (gtag.js) - Google Analytics -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id=G-90E1JB4HW4"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', 'G-90E1JB4HW4');
+  </script>
+{% endblock %}
\ No newline at end of file