diff --git a/_includes/head.html b/_includes/head.html
index 29103ab..8b3cdde 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -53,5 +53,10 @@
             {%- include analytics.html -%}
         {% endif %}
         <!-- End Google Analytics -->
-    
+
+        <!-- add bootstrap -->
+        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
+        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
+        <!-- end of bootstrap -->
+        
 </head>