diff --git a/presentation/index.html b/presentation/index.html
index 6799c06..2ee0992 100644
--- a/presentation/index.html
+++ b/presentation/index.html
@@ -20,6 +20,10 @@
     <!-- For syntax highlighting -->
     <link rel="stylesheet" href="lib/css/zenburn.css">
 
+    <style type="text/css" media="screen">
+      .reveal pre code { max-height: 500px; }
+    </style>
+
     <!-- If the query includes 'print-pdf', use the PDF print sheet -->
     <script>
       document.write( '<link rel="stylesheet" href="css/print/' + ( window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper' ) + '.css" type="text/css" media="print">' );