<title>Bootstrap 3 Modal Scrollable</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" crossorigin="anonymous"></script>
max-height: calc(100vh - 212px);
<h1>Bootstrap 3 Modal Scrollable</h1>
<p>Add some CSS to the div containing class <code>.modal-dialog</code> to make modal scrollable.</p>
<button type="button" class="btn btn-primary" data-target="#ModalScrollable" data-toggle="modal">Open Modal</button>
<div class="modal fade" id="ModalScrollable">
<div class="modal-dialog modal-dialog-centered">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Notification</h4>
Please scroll down <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
Are you sure you want to continue?
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>