diff --git a/free-programming-books.md b/free-programming-books.md
index 49ef87e30d2f35b6b7967b86f11b691f3f7fc9c5..8f91185d2eb64b2d066eaa14da938db60e234d25 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -1208,8 +1208,8 @@
 * [MaintainableCSS](http://maintainablecss.com)
 * [Pro HTML5 Programming]( http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html)
 * [Scalable and Modular Architecture for CSS](https://smacss.com) - Jonathan Snook
+* [Understanding Flexbox: Everything you need to know](https://ohansemmanuel.github.io/uf_download.html) - Ohans Emmanuel
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus
-* [Understanding Flexbox: Everything you need to know] (https://ohansemmanuel.github.io/uf_download.html) - Ohans Emmanuel
 
 
 #### Bootstrap
diff --git a/free-programming-playgrounds.md b/free-programming-playgrounds.md
index 632f55bd512b37aa6981917c81c7b0c01aee54aa..6812786ea1f0d5fe4b393236478d0378e7bf2a6f 100644
--- a/free-programming-playgrounds.md
+++ b/free-programming-playgrounds.md
@@ -1,8 +1,8 @@
 ### Index
 
 * [Angular](#angular)
-* [CSS](#css)
 * [Crystal](#crystal)
+* [CSS](#css)
 * [FlexBox](#flexbox)
 * [JavaScript](#javascript)
 * [Node.js](#nodejs)
@@ -17,6 +17,11 @@
 * [Plunker](http://plnkr.co)
 
 
+### Crystal
+
+* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)
+
+
 ### CSS
 
 * [CodePen](http://codepen.io)
@@ -25,11 +30,6 @@
 * [Dabblet](http://dabblet.com)
 
 
-### Crystal
-
-* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)
-
-
 ### FlexBox
 
 * [Echoplex](http://the-echoplex.net/flexyboxes/)