diff --git a/react.md b/react.md
index ffdbbae00..46b06ed08 100644
--- a/react.md
+++ b/react.md
@@ -351,6 +351,7 @@ var SetIntervalMixin = {
   componentWillMount: function() { .. }
 }
 ```
+{:.light}
 
 ```js
 var TickTock = React.createClass({