bootstrap tutorial - How to remove slide down effect from Bootstrap modal - bootstrap examples - bootstrap templates - bootstrap 3
Answer: Remove the fade Class from Modal
By default, on activation the Bootstrap modal window is displayed after a short slide down transition. However, if you don't like this and want to remove the animation just take out the fade class from the .modal element. Here's an example.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Remove Slide Animation from Bootstrap Modals - Wikitechy</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/bootstrap-theme.min.css">
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<!-- Button HTML (to Trigger Modal) -->
<a href="#myModal" class="btn btn-lg btn-primary" data-toggle="modal">Launch Demo Modal</a>
<!-- Modal HTML -->
<div id="myModal" class="modal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Confirmation</h4>
</div>
<div class="modal-body">
<p>Do you want to save changes you made to document before closing?</p>
<p class="text-warning"><small>If you don't save, your changes will be lost.</small></p>
</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>
</body>
</html>