JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<a href="#" class="btn btn-default" data-toggle="modal" data-target="#testModal">Show dialog</a>

<div class="modal fade modal-draggable" id="testModal" tabindex="-1" role="dialog" aria-labelledby="testModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <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="testModalLabel">Test dialog</h4>
      </div>
      <div class="modal-body">
          <p>Test dialog...</o
      </div>
    </div>
  </div>
</div>

CSS

.modal-draggable .modal-backdrop {
  position: fixed;
}

.modal.modal-draggable {
    overflow: overflow-y;
}

.modal-draggable .modal-header:hover {
  cursor: move;
}

JavaScript

$(".modal-draggable .modal-dialog").draggable({
    handle: ".modal-header"
});