JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<div class="row">
	<div class="col-sm-7" style="background: green; height: 300px;">
		<p>A</p>
	</div>
	<div class="col-sm-5 float-sm-right" style="background: blue; height: 600px;">
		<p>B</p>
	</div>
	<div class="col-sm-7" style="background: red; height: 300px;">
		<p>C</p>
	</div>

</div>

CSS

@media (min-width: 768px) {
		.b-col {
			float: right;
		}
	}