CSS selector: how to style items [1-2][5-6][9-10] etc by pair

Tags: css,css3,css-selectors

Problem :

I have a list of items, I want style them by group of two, and alternate style between groups. So items [1-2][5-6][9-10] could be { background-color: #C0C0C0 ;} while [3-4][7-8][11-12]... could be { background-color: #FFF ;}.

For a result such:

  1. grey
  2. grey
  3. black
  4. black
  5. grey
  6. grey
  7. black
  8. black
  9. grey
  10. grey
  11. black
  12. black
  13. ...

Which CSS nth-child formula should I use?

Solution :

Working jsFiddle here.

Use :nth-child(4n+3), :nth-child(4n+4)


li:nth-child(4n+4), li:nth-child(4n+3) {



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