JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
      This is the firrst modal
      <button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal2">
        Launch Second Modal
      </button>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<!-- Modal -->
<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        This is the second modal
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn...

JavaScript

var scrollPos = 0;
// Only one of these modals should show at a time.
$('#myModal2').on('show.bs.modal', function (e) {
  $('#myModal').modal('hide');
  $('body').css({
    overflow: 'hidden',
    position: 'fixed',
    top : -scrollPos
  });
}).on('hide.bs.modal', function (e) {
  $('#myModal').modal('show').on('hidden.bs.modal', function (e) {
    $('body').css({
      overflow: '',
      position: '',
      top: ''
    }).scrollTop(scrollPos);
	});
});

jQuery(document).on('click','[data-toggle*=modal]',function(){
  jQuery('[role*=dialog]').each(function(){
    switch(jQuery(this).css('display')){
      case('block'):{jQuery('#'+jQuery(this).attr('id')).modal('hide'); break;}
    }
  });
});