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<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>

    <div class="container-fluid">
     <div class="row">
        <div class="col-md-4 bg-info">
            <p>ブラウザを広げるとcontainerの横幅が拡がる</p>
            <p>bg-info</p>
        </div>
        <div class="col-md-4 bg-primary">
            <p>bg-primary</p>
        </div>
        <div class="col-md-4 bg-success">
            <p>bg-success</p>
        </div>
     </div>
    </div>