Groundwork — интересный CSS/HTML5 UI фреймворк

  .right-one { left:$one-twelfth; }
  .right-two { left:$two-twelfths; }
  .right-three { left:$three-twelfths; }
  .right-four { left:$four-twelfths; }
  .right-five { left:$five-twelfths; }
  .right-six { left:$six-twelfths; }
  .right-seven { left:$seven-twelfths; }
  .right-eight { left:$eight-twelfths; }
  .right-nine { left:$nine-twelfths; }
  .right-ten { left:$ten-twelfths; }
  .right-eleven { left:$eleven-twelfths; }
  .right-twelve { left:$twelve-twelfths; }