diff --git a/layouts/partials/head/custom.html b/layouts/partials/head/custom.html
index 509d671..2c76965 100644
--- a/layouts/partials/head/custom.html
+++ b/layouts/partials/head/custom.html
@@ -1,5 +1,13 @@
 <meta name="google-site-verification" content="jV0P9NY3xwKw4I9KsQV3BqlxxX3oZ01WfUxdeD9mjUI" />
 <meta name="msvalidate.01" content="8AF0E3D49317671E996A7A8C11DB8EC7" />
+<!-- Clarity tracking code for https://tiennm99.github.io/ -->
+<script>
+    (function(c,l,a,r,i,t,y){
+        c[a]=c[a]||function(){(c[a].q=c[a].q||[]).push(arguments)};
+        t=l.createElement(r);t.async=1;t.src="https://www.clarity.ms/tag/"+i+"?ref=bwt";
+        y=l.getElementsByTagName(r)[0];y.parentNode.insertBefore(t,y);
+    })(window, document, "clarity", "script", "r00axbj1zq");
+</script>
 <!-- Google Tag Manager -->
 <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
 new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],