<div id="accordion" class="panel-group">
    <div class="panel panel-default">
        <div class="panel-heading">
            <h5 class="panel-title">
                <a href="#collapseOne" data-parent="#accordion" data-toggle="collapse" aria-expanded="false"
                   class="collapsed">Collapsible Group Item #1</a>
            </h5>
        </div>
        <div class="panel-collapse collapse" id="collapseOne" aria-expanded="false" style="height: 0px;">
            <div class="panel-body">
                Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et
                dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
                ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
                fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
                deserunt mollit anim id est laborum.
            </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a href="#collapseTwo" data-parent="#accordion" data-toggle="collapse" class="collapsed"
                   aria-expanded="false">Collapsible Group Item #2</a>
            </h4>
        </div>
        <div class="panel-collapse collapse" id="collapseTwo" aria-expanded="false" style="height: 0px;">
            <div class="panel-body">
                Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et
                dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
                ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
                fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
                deserunt mollit anim id est laborum.
            </div>
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title">
                <a href="#collapseThree" data-parent="#accordion" data-toggle="collapse" class="" aria-expanded="true">Collapsible
                    Group Item #3</a>
            </h4>
        </div>
        <div class="panel-collapse collapse in" id="collapseThree" aria-expanded="true" style="">
            <div class="panel-body">
                Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et
                dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
                ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
                fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
                deserunt mollit anim id est laborum.
            </div>
        </div>
    </div>
</div>