Here is the working example for Bootstrap 4.3
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>_x000D_
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>_x000D_
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<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">_x000D_
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<div class="accordion" id="accordionExample">_x000D_
<div class="card">_x000D_
<div class="card-header" id="headingOne" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">_x000D_
<h2 class="mb-0">_x000D_
<button class="btn btn-link" type="button" >_x000D_
Collapsible Group Item #1_x000D_
</button>_x000D_
</h2>_x000D_
</div>_x000D_
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<div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">_x000D_
<div class="card-body">_x000D_
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</div>_x000D_
</div>_x000D_
</div>_x000D_
<div class="card">_x000D_
<div class="card-header" id="headingTwo" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">_x000D_
<h2 class="mb-0">_x000D_
<button class="btn btn-link collapsed" type="button" >_x000D_
Collapsible Group Item #2_x000D_
</button>_x000D_
</h2>_x000D_
</div>_x000D_
<div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">_x000D_
<div class="card-body">_x000D_
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</div>_x000D_
</div>_x000D_
</div>_x000D_
<div class="card">_x000D_
<div class="card-header" id="headingThree" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">_x000D_
<h2 class="mb-0">_x000D_
<button class="btn btn-link collapsed" type="button" >_x000D_
Collapsible Group Item #3_x000D_
</button>_x000D_
</h2>_x000D_
</div>_x000D_
<div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">_x000D_
<div class="card-body">_x000D_
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</div>_x000D_
</div>_x000D_
</div>_x000D_
</div>
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