Fuentes:
1. http://codepen.io/MorenoDiDomenico/pen/MYoMYQ
2.http://codepen.io/jennyveens/pen/GgEdpy
3.http://codepen.io/lbebber/pen/RNgBPP
4.http://codepen.io/lbebber/pen/rawQKR
5.http://codepen.io/mehmetmert/pen/MYmxXx
6.http://codepen.io/ilanf/pen/ramzxe
7.http://codepen.io/masumonline/pen/PwmPeR
8.http://codepen.io/SitePoint/pen/PwmjYp
9.http://codepen.io/HieuHuynh/pen/ogZNbY
10.http://bradsknutson.com/blog/simple-css-navigation-menu/
11.http://codepen.io/thecolonizemarseffort/pen/tefnB
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