diff --git a/index.html b/index.html
index 17476803..0c8174b4 100644
--- a/index.html
+++ b/index.html
@@ -100,6 +100,8 @@
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
 <script type="text/javascript" src="http://www.pirilampo.org/styles/lib/js/jquery.stickytableheaders.js"></script>
 <script type="text/javascript" src="http://www.pirilampo.org/styles/readtheorg/js/readtheorg.js"></script>
+<style type="text/css">
+ pre.src {background-color: #263238; color: #ffffff;}</style>
 <style type="text/css">
  pre.src {background-color: #263238; color: #ffffff;}</style>
 <script type="text/javascript">