diff --git a/index.html b/index.html
index 048423e..2ac9a50 100644
--- a/index.html
+++ b/index.html
@@ -10,6 +10,7 @@
   <link rel="stylesheet" href="web/default.min.css">
   <script src="web/highlight.min.js"></script>
   <script src="web/script.js"></script>
+  <script async defer src="https://buttons.github.io/buttons.js"></script>
 </head>
 
 <style>