Fixes #489

free-programming-books.md

@@ -161,7 +161,7 @@
 * [ShaderX series](http://tog.acm.org/resources/shaderx/)
 * [Tutorials for modern OpenGL](http://www.opengl-tutorial.org/)
 * [OpenGL Programming Guide (The Red Book)](http://fly.srk.fer.hr/~unreal/theredbook/)
-* [Blender 3D: Noob to Pro] (http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro)
+* [Blender 3D: Noob to Pro](http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro)
 
 ###Graphical User Interfaces
 * [Programming with gtkmm 3](https://developer.gnome.org/gtkmm-tutorial/stable/)
@@ -685,6 +685,8 @@
 * [Learn CSS Layout](http://learnlayout.com/)
 * [Scalable and Modular Architecture for CSS](http://smacss.com) - Jonathan Snook
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus
+* [A beginner's guide to HTML&CSS](http://learn.shayhowe.com/html-css/)
+* [An advanced guide to HTML&CSS](http://learn.shayhowe.com/advanced-html-css/)
 
 
 ###Icon