<div class="container mt-5">
<div class="row">
<div class="col-md-9">
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myExtraLargeModalLabel">
Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade bd-example-modal-xl" tabindex="-1" role="dialog" aria-labelledby="myExtraLargeModalLabel" aria-hidden="true" id="myExtraLargeModalLabel">
<div class="modal-dialog modal-xl">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">My PDF</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="row">
<div class="col-md-12">
<iframe src="https://classics.berkeley.edu/sites/default/files/2020-01/sample.pdf" style="width: 100%;height: 560px;border: none;"></iframe>
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>