diff --git a/docs/index.html b/docs/index.html
index 8cd2488bb..374f7a141 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -17,6 +17,7 @@
     />
     <!-- <link rel="stylesheet" href="//unpkg.com/docsify/lib/themes/vue.css"> -->
     <link rel="stylesheet" href="theme.css" />
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
     <script src="//cdn.jsdelivr.net/npm/mermaid@9.1.3/dist/mermaid.min.js"></script>
     <!-- <script src="http://localhost:9000/mermaid.js"></script> -->
     <script>