#button.close-back
  .b1
  .b2
  .b3
  .b4
#button.next-back
  .b1
  .b2
  .b3
  .b4
  
/* DEMO ONLY*/
%h4 Circular Buttons Animation Concept
%a#next(href="http://codepen.io/fbrz/pen/LwlqI" target="_parent") CSS only: 100 followers jelly cake!! ►