Basic UIKit

HTML

<script src="http://www.getuikit.com/dist/js/uikit.min.js"></script>
<link rel="stylesheet" href="http://getuikit.com/docs/css/uikit.docs.min.css">
<div class="uk-grid-collapse uk-child-width-1-2 uk-flex uk-grid" data-uk-grid-margin>
  <div class="grid-box">
    1
  </div>
  <div class="grid-box">
    2
  </div>
  <div class="grid-box">
    3
  </div>
  <div class="grid-box">
    4
  </div>
</div>

CSS

.grid-box {
  border: 1px solid;
  height: 50px;
  width: 50px;
}