diff --git a/src/main/overview.html b/src/main/overview.html
index 17080565..51879411 100644
--- a/src/main/overview.html
+++ b/src/main/overview.html
@@ -5,7 +5,7 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Welcome file</title>
-  <link rel="stylesheet" href="https://stackedit.io/style.css" />
+  <link rel="stylesheet" href="https://stackedit.io/style.css" integrity="Y2zH5z5hlWA5qWiRJXFGomQWmbSsOts2cpzkG241KkqQVNx/1WD8YcZT+kq5w0H5" />
 </head>
 
 <body class="stackedit">
