<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Fluid grid with offset class</title>
    <style>

    * { box-sizing: border-box; }

    body {
      width: 90%;
      max-width: 980px;
      margin: 0 auto;
    }

    .wrapper {
      padding-right: 2.08333333%;
    }

    .row {
      clear: both;
    }

    .col {
      float: left;
      margin-left: 2.08333333%;
      width: 6.25%;
      background: rgb(255,150,150);
    }

    /* Two column widths (12.5%) plus one gutter width (2.08333333%) */
    .col.span2 { width: 14.58333333%; }
    /* Three column widths (18.75%) plus two gutter widths (4.1666666) */
    .col.span3 { width: 22.91666666%; }
    /* And so on... */
    .col.span4 { width: 31.24999999%; }
    .col.span5 { width: 39.58333332%; }
    .col.span6 { width: 47.91666665%; }
    .col.span7 { width: 56.24999998%; }
    .col.span8 { width: 64.58333331%; }
    .col.span9 { width: 72.91666664%; }
    .col.span10 { width: 81.24999997%; }
    .col.span11 { width: 89.5833333%; }
    .col.span12 { width: 97.91666663%; }

    .offset-by-one {
      margin-left: 10.41666666%;
    }

    </style>
  </head>

  <body>
    <div class="wrapper">
      <div class="row">
        <div class="col">1</div>
        <div class="col">2</div>
        <div class="col">3</div>
        <div class="col">4</div>
        <div class="col">5</div>
        <div class="col">6</div>
        <div class="col">7</div>
        <div class="col">8</div>
        <div class="col">9</div>
        <div class="col">10</div>
        <div class="col">11</div>
        <div class="col">12</div>
      </div>
      <div class="row">
        <div class="col span1">13</div>
        <div class="col span5 offset-by-one">14</div>
        <div class="col span3">15</div>
        <div class="col span2">16</div>
      </div>
    </div>
  </body>
</html>
