diff --git a/public/X3DOMTutorial/hellox3dom.html b/public/X3DOMTutorial/hellox3dom.html
index b6d10b4ffd5876eaa0c00aac472bfa9c5a7f933b..8d9e40de2ddf1dcb613f8077534de76319985259 100644
--- a/public/X3DOMTutorial/hellox3dom.html
+++ b/public/X3DOMTutorial/hellox3dom.html
@@ -5,7 +5,7 @@
   <title> Hello X3DOM </title>
   <link rel="stylesheet" type="text/css" href="x3dom.css">
   </link>
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.5.1/styles/vs.min.css">
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.5.1/styles/vs.min.css"></link>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.5.1/highlight.min.js"></script>
   <script>hljs.highlightAll();</script>
 </head>