JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<div class="row">
  <div class="col-xs-3">
    <div id="sidebar">sidebar</div>
  </div>
  <div class="col-xs-3">content content content content content content content content content content content content content content content</div>
</div>

CSS

.row {
  overflow: hidden;
}

[class*="col-"] {
  margin-bottom: -99999px;
  padding-bottom: 99999px;
  background: #ccc;
  color: #fff;
  border: 1px solid #fff;
}