<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<h2>Stepper configuarator</h2>
</div>
<div class="row">
<div class="col-md-6">
<img class="img-fluid" src="http://turbonailsystem.ro/wp-content/uploads/2018/04/tns-bg.jpg">
</div>
<div class="col-md-6">
<div class="row">
<div class="col-3 ">
<div class="option border" data-toggle="collapse" data-target="#imageSelect" aria-expanded="false" aria-controls="imageSelect">
<img class="img-fluid" src="https://t4.ftcdn.net/jpg/01/19/27/69/240_F_119276949_GufJOzBkOOQnccRpWXyaq6khnyp81SR7.jpg">
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</div>
</div>
<div class="col-3 border" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">
<img class="img-fluid" src="https://t4.ftcdn.net/jpg/01/19/27/69/240_F_119276949_GufJOzBkOOQnccRpWXyaq6khnyp81SR7.jpg">
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</div>
</div>
<div class="collapse" id="collapseExample">
<div class="card card-body">
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</div>
