Code:
<html lang="en">
<head>
<title>Title</title>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<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">
</head>
<body>
<div class="card">
<div class="card-header" id="headingOne">
<h5 class="mb-0">
<button class="btn btn-link" data-toggle="collapse" data-target="#collapseOne" aria-
expanded="true" aria-controls="collapseOne">
Collapsible Group Item #1
</button>
</h5>
</div>
<div id="collapseOne" class="collapse show text-center" aria-labelledby="headingOne" style="background-color: yellow;">
<div class="card-body mx-auto" style="width:300px; ">
<div class="card ">
<div class="card-header text-center" id="headingTwo" >
<h5 class="mb-0">
<button class="btn btn-link collapsed text-center" data- toggle="collapse" data-
target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo" style="width:300px;">
Collapsible Group Item #2
</button>
</h5>
</div>
<div id="collapseTwo" class="collapse show" aria-labelledby="headingTwo">
<div class="card-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus wolf moon
officia aute, non cupidatat skateboard dolor brunch. Food eiusmod. Brunch 3 wolf moon tempor, sunt
aliqua put a bird on it assumenda shoreditch et. Nihil anim keffiyeh helvetica,
craft beer sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings
farm-to-table, raw denim aesthetic synth nesciunt you probably labore sustainable VHS.
</div>
</div>
</div>
</div>
</div>
</div>
<div class="card">
<div class="card-header" id="headingThree">
<h5 class="mb-0">
<button class="btn btn-link collapsed" data-toggle="collapse" data-
target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
Collapsible Group Item #3
</button>
</h5>
</div>
<div id="collapseThree" class="collapse" aria-labelledby="headingThree">
<div class="card-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry wolf moon
officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa eiusmod. Brunch 3 wolf moon
tempor, sunt aliqua put a bird on it squid single- assumenda shoreditch
et. Nihil anim keffiyeh helvetica, craft beer labore wes sapiente ea proident. Ad vegan
excepteur butcher vice lomo. Leggings occaecat farm-to-table, raw denim aesthetic synth nesciunt you
probably haven't heard of labore sustainable VHS.
</div>
</div>
</div>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>