Html 带按钮的平底手风琴

我有这个街区

<div class="panel-group panel-group-lists collapse in" id="accordion2">            
        <div class="panel panel-margin">
            <div class="panel-heading">
                <h4 class="panel-title">
                    <a data-toggle="collapse" data-parent="#accordion2" href="#collapseFour" class="collapsed">
                        <span class="badge badge-danger badge-reports badge-reports-text">NEW</span>
                        <span class="report-title">VIN Code 1M8GDM9A_KPO42788</span>
                        <span class="report-date">11 jun / 12:54 AM</span>
                        <!-- dropdown must be here -->
                    </a>
                </h4>
            </div>
            <div id="collapseFour" class="panel-collapse collapse" style="height: 0;">
                <div class="panel-body">
                    Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
                </div>
            </div>
        </div>
</div>

动物保护协会的陈词滥调，埃尼姆·埃乌斯莫德的高寿命accusamus terry richardson广告鱿鱼。3狼月亮奥特餐厅，非丘比特滑板多洛早午餐。食品车奎奴亚藜。早午餐3狼月亮临时，圣塔阿利夸放了一只鸟在上面鱿鱼单一来源咖啡NullaAssumenda shoreditch等Nihil anim keffiyeh helvetica，工艺啤酒工人wes anderson cred Nesciut sapiente ea proident。纯素食主义者，屠夫副洛莫。紧身裤从工艺啤酒场到餐桌，生料牛仔布美学合成物，你可能还没听说过accusamus labore可持续VHS。

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我需要添加下拉按钮在面板的右侧部分与glyphicon选项水平图标。这个手风琴怎么扣？我尝试了我在bootflat和bootstrap中找到的所有内容：输入组btn等。请帮助我解决此问题。

添加了一个类似这样的

span

<a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseFour" class="collapsed">
   <span class="badge badge-danger badge-reports badge-reports-text">NEW</span>
   <span class="report-title">VIN Code 1M8GDM9A_KPO42788</span>
   <span class="report-date">11 jun / 12:54 AM</span>
   <span class="glyphicon glyphicon-option-horizontal"></span>
</a>

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希望这会有所帮助。

添加了这样一个

span

<a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapseFour" class="collapsed">
   <span class="badge badge-danger badge-reports badge-reports-text">NEW</span>
   <span class="report-title">VIN Code 1M8GDM9A_KPO42788</span>
   <span class="report-date">11 jun / 12:54 AM</span>
   <span class="glyphicon glyphicon-option-horizontal"></span>
</a>

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希望这会有所帮助。

您希望将下拉列表精确放置在何处。哪个div？我需要

a

tag中的下拉列表，您想将下拉列表准确地放在哪里。哪个div？我需要

a

标签中的下拉列表