**** code:
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" class=""> Thêm version mới</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse in" style="height: auto;">
<div class="panel-body">
<form action="" method="POST" role="form">
<legend>Thêm version mới</legend>
<div class="form-group">
<label for="">Version</label>
<input type="text" class="form-control" id="" placeholder="Input field" name="name_version">
</div>
<div class="form-group">
<label for="">Ngày hoàn thành</label>
<input type="text" class="form-control" id="" placeholder="Input field" name="date_version" value="1605522194">
</div>
<h4>Nội dung</h4>
<input type="hidden" id="content_version" name="content_version">
<button type="submit" class="btn btn-primary">Save vertsion mới</button>
<hr>
</form>
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" class="collapsed">
Các version hiện tại
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse" style="height: 0px;">
<div class="panel-body">
<table class="table table-hover">
<thead>
<tr>
<th>11</th>
</tr>
</thead>
<tbody>
<tr>
<td>22</td>
</tr>
</tbody>
</table>
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" class="">
Thêm version mới
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse" style="height: auto;">
<div class="panel-body">
<form action="" method="POST" role="form">
<legend>Thêm version mới</legend>
<div class="form-group">
<label for="">Version</label>
<input type="text" class="form-control" id="" placeholder="Input field" name="name_version">
</div>
<div class="form-group">
<label for="">Ngày hoàn thành</label>
<input type="text" class="form-control" id="" placeholder="Input field" name="date_version" value="1605522194">
</div>
<h4>Nội dung</h4>
<input type="hidden" id="content_version" name="content_version">
<button type="submit" class="btn btn-primary">Save vertsion mới</button>
<hr>
</form>
</div>
</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" class="collapsed">
Các version hiện tại
</a>
</h4>
</div>
<div id="collapseOne" class="panel-collapse collapse" style="height: 0px;">
<div class="panel-body">
<table class="table table-hover">
<thead>
<tr>
<th>11</th>
</tr>
</thead>
<tbody>
<tr>
<td>22</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
