JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
    <div class="row">
      <div class="col-xs-6 col-sm-4 col-md-3">
        <div class="item"> ... </div>
      </div>
      <div class="col-xs-6 col-sm-4 col-md-3">
        <div class="item"> ... </div>
      </div>
      <div class="col-xs-6 col-sm-4 col-md-3">
        <div class="item"> ... </div>
      </div>
      <div class="col-xs-6 col-sm-4 col-md-3">
        <div class="item"> ... </div>
      </div>
    </div> <!-- / .row -->

CSS

.item {
    height: 50px;
    background: gray;
    margin-bottom: 20px;
}