Bootstrap modal popup

Bootstrap 4 Modal popup

<div class="modal fade" id="myModal">
<div class="modal-dialog modal-dialog-centered modal-dialog-scrollable">
<div class="modal-content">			  
<!-- Modal Header -->
<div class="modal-header">
<h4 class="modal-title">Modal Heading</h4>
<button type="button" class="close" data-dismiss="modal">&times;</button>
</div>				
<!-- Modal body -->
<div class="modal-body">
Modal body..
</div>
<!-- Modal footer -->
<div class="modal-footer">
<button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
</div>				
</div>
</div>
</div>

CSS

Boostrap CSS