diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,7 +1,12 @@
-# Flexbox Playground CSS3 FlexBox 在线调试：http://www.fly63.com/tool/flexbox/
+# Flexbox Playground   
+CSS3 FlexBox 在线调试：  
+http://www.fly63.com/tool/flexbox/  
+https://codepen.io/whqet/full/vOEjVK/  
+  
+文档解说：   
+https://www.ruanyifeng.com/blog/2015/07/flex-grammar.html
 
 This is project to demonstrate the capabilities of the CSS3 Flexbox Layout.
-文档解说： https://www.ruanyifeng.com/blog/2015/07/flex-grammar.html
 
 ## Prerequisites