diff --git a/book/_config.yml b/book/_config.yml
index 6de6e88..b48e26f 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -44,4 +44,6 @@ parse:
 sphinx:
   config:
     mathjax_path: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
-    language: pt
\ No newline at end of file
+    language: pt
+    templates_path:
+      - _templates
\ No newline at end of file
diff --git a/book/_templates/layout.html b/book/_templates/layout.html
new file mode 100644
index 0000000..8243500
--- /dev/null
+++ b/book/_templates/layout.html
@@ -0,0 +1,15 @@
+{%- extends "!layout.html" %}
+{%- block extrahead %}
+{{ super() }}
+
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-code"></script>
+<script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag() { dataLayer.push(arguments); }
+    gtag('js', new Date());
+
+    gtag('config', 'G-JSWERJSPMN');
+</script>
+
+{%- endblock %}
\ No newline at end of file