Summer Gradient

This is what I have in mind when I think of the Summer 2013 in Germany (which really sucks and I hate it most of the time). So there should be more grey/blue, but I love symmetry :D So fuck my mind and create something "cool".

You can see the live version and the source code on CodePen:
http://codepen.io/TimPietrusky/pen/JEbiI