diff --git a/public/X3DOMTutorial/externalfile.html b/public/X3DOMTutorial/externalfile.html
index 2b9630392e4107c4ec7cb00f63da905d65668e7e..4eac99a3b3d7984d88ffe3df2820597b42ec54c7 100644
--- a/public/X3DOMTutorial/externalfile.html
+++ b/public/X3DOMTutorial/externalfile.html
@@ -5,6 +5,9 @@
<title> External File </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">
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.5.1/highlight.min.js"></script>
+ <script>hljs.highlightAll();</script>
</head>
<body>
@@ -26,13 +29,24 @@
performance a lot.
</p>
<pre>
-<X3D id="shapedata">
- <Scene>
- <background transparency='0' skyColor='1 1 1'></background>
- <inline url="HFT_Bau1_0.x3d"></inline>
- </Scene>
-</X3D>
-</pre>
+<code class="language-html">
+<html>
+<head>
+ <title> External File e</title>
+ <script type='text/javascript' src='http://www.x3dom.org/download/x3dom.js'> </script>
+ <link rel='stylesheet' type='text/css' href='http://www.x3dom.org/download/x3dom.css'></link>
+</head>
+<body>
+ <X3D id="shapedata">
+ <Scene>
+ <background transparency='0' skyColor='1 1 1'></background>
+ <inline url="HFT_Bau1_0.x3d"></inline>
+ </Scene>
+ </X3D>
+</body>
+</html>
+</code>
+</pre>
<select id="combo" style="margin-bottom:20px" onchange="comboCallback();">
<option value="x3d/HFT_Bau1_0.x3d">HFT Building 1 Floor 0</option>
<option value="x3d/HFT_Bau1_1.x3d">HFT Building 1 Floor 1</option>
@@ -55,4 +69,4 @@
</script>
</body>
-</html>
\ No newline at end of file
+</html>