How to set a panel as active by default on the first load, The code below shows as the dynamic page show help me to solve the issue:
<div class="panel-group collapse-style-1" id="accordion">
<?php foreach ($careers['result'] as $resclients){?>
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne<?php echo $conn->stripval($resclients['career_id']);?>" aria-expanded="true" class="collapsed">
<i class="fa fa-life-ring pr-10"></i><?php echo $conn->stripval($resclients['job_title']);?> - <?php echo $conn->stripval($resclients['experience']);?>
</a>
</h4>
</div><br>
<div id="collapseOne<?php echo $conn->stripval($resclients['career_id']);?>" class="panel-collapse collapse" aria-expanded="true" style="height: 0px;">
<div class="panel-body">
<?php echo $conn->stripval($resclients['job_desc']);?>
</div>
</div>
</div>
<?php } ?>
</div>