<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS grids example</title>
    <style>

    .wrapper {
      width: 90%;
      max-width: 960px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      grid-gap: 20px;
    }

    .col {
      background: rgb(255,150,150);
    }

    .span2 { grid-column: auto / span 2;}
    .span3 { grid-column: auto / span 3;}
    .span4 { grid-column: auto / span 4;}
    .span5 { grid-column: auto / span 5;}
    .span6 { grid-column: auto / span 6;}
    .span7 { grid-column: auto / span 7;}
    .span8 { grid-column: auto / span 8;}
    .span9 { grid-column: auto / span 9;}
    .span10 { grid-column: auto / span 10;}
    .span11 { grid-column: auto / span 11;}
    .span12 { grid-column: auto / span 12;}

    </style>
  </head>

  <body>
    <div class="wrapper">
      <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 class="col">13some<br>content</div>
      <div class="col span6">14this<br>is<br>more<br>content</div>
      <div class="col span3">15this<br>is<br>less</div>
      <div class="col span2 content">16</div>
    </div>
  </body>
</html>
