ects the nearest matching container
                });
                </code>
                </pre>
            </div>
        </div>
    </article>

    <div class="container">
        <div class="row">
            <div class="col-md-12">
                <a href="#" class="btn btn-primary toggle-panels">Toggle All</a>
            </div>
        </div>
    </div>

    <section class="container">
        <div class="row">
            <div class="col-md-3">
                <div class="panel-container">
   