JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<div class="container">
    <div class="row">
        <div class="col-xs-4">
            <div class="array-item">1</div>
            <div class="array-item">2</div>
            <div class="array-item">3</div>
        </div>
        <div class="col-xs-4">
            <div class="array-item">4</div>
            <div class="array-item">5</div>
            <div class="array-item">6</div>
        </div>
        <div class="col-xs-4">
            <div class="array-item">7</div>
            <div class="array-item">8</div>
            <div class="array-item">9</div>
        </div>        
    </div>
</div>

CSS

.array-item {
    border: 1px solid #333;
    margin-bottom: 15px;
}