<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<button data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" class="btn btn-primary">Feedback form</button>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">
<div id="carsearch-mobile" data-src="https://www.google.com/maps/embed?pb=!1m0!3m2!1sde!2sus!4v1477413845934!6m8!1m7!1sdnK7KCRD21wAAAQo8X6xJA!2m2!1d51.48150236104869!2d7.142771589600898!3f359!4f0!5f0.7820865974627469" class="tab-pane">
<div id="carsearch-loader" class="wrap-loading">
<div class="loading loading-3"></div>
</div>
<iframe id="carsearch-sidebar" src="" class="carsearch-iframe" frameborder="0" width="100%" height="320px" scrolling="no"></iframe>
</div>
</div>
</div>
</div>