Fieldset with Input

<link rel="stylesheet" href="https://bootstraptema.ru/plugins/2015/bootstrap3/bootstrap.min.css" />

<style>
 body {
 padding-top: 50px;
 }
 
 legend a {
 color: inherit;
 }
 
 legend.legendStyle {
 padding-left: 5px;
 padding-right: 5px;
 }
 
 fieldset.fsStyle {
 font-family: Verdana, Arial, sans-serif;
 font-size: small;
 font-weight: normal;
 border: 1px solid #999999;
 padding: 4px;
 margin: 5px;
 }
 
 legend.legendStyle {
 font-size: 90%;
 color: #888888;
 background-color: transparent;
 font-weight: bold;
 }
 
 legend {
 width: auto;
 border-bottom: 0px;
 }
</style>
<div class="container">
 <div class="cold-md-12">
 <fieldset class="fsStyle">



 <legend class="legendStyle">
 <a data-toggle="collapse" data-target="#demo" href="#">Activity Log Filter Criteria</a>
 </legend>
 <div class="row collapse in" id="demo">
 <div class="col-md-2">
 <label for="activity_from_date" class="labelStyle">Activity From Date:</label>
 </div>
 <div class="col-md-4">
 <input name="fromDate" maxlength="10" size="11" tabindex="59" value="" onblur="javascript:DateFormat(this,event,true);" class="textInput" id="activity_from_date" type="text">
 </div>
 </div>
 </fieldset>
 </div>
</div>