Vertically centering Bootstrap modal window

Question

I would like to center my modal on the viewport (middle) I tried to add some css properties

 .modal { position: fixed; top:50%; left:50%; }   

Answer 1

This does the job : http://jsfiddle.net/sRmLV/1140/

It uses a helper-div and some custom css. No javascript or jQuery required.

HTML (based on Bootstrap's demo-code)

<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" aria-hidden="true">
    <div class="vertical-alignment-helper">
        <div class="modal-dialog vertical-align-center">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span>

                    </button>
                     <h4 class="modal-title" id="myModalLabel">Modal title</h4>

                </div>
                <div class="modal-body">...</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>
</div>

CSS

.vertical-alignment-helper {
    display:table;
    height: 100%;
    width: 100%;
    pointer-events:none; /* This makes sure that we can still click outside of the modal to close it */
}
.vertical-align-center {
    /* To center vertically */
    display: table-cell;
    vertical-align: middle;
    pointer-events:none;
}
.modal-content {
    /* Bootstrap sets the size of the modal in the modal-dialog class, we need to inherit it */
    width:inherit;
    max-width:inherit; /* For Bootstrap 4 - to avoid the modal window stretching full width */
    height:inherit;
    /* To center horizontally */
    margin: 0 auto;
    pointer-events: all;
}

Answer 2

this Works for me perfectly:

.modal {
text-align: center;
padding: 0!important;
}

.modal:before {
content: '';
display: inline-block;
height: 100%;
vertical-align: middle;
margin-right: -4px;
}

.modal-dialog {
display: inline-block;
text-align: left;
vertical-align: middle;
}

complete Demo URL : https://codepen.io/dimbslmh/full/mKfCc

Answer 3

you can use:

.modal {
    position: fixed;
    top: 50% !important;
    left: 50%;
    transform: translate(-50%, -50%);
}

to center it both vertically and horizontally.

Answer 4

You can achieve vertical alignment center on Bootstrap 3 modal like that :

.modal-vertical-centered {
  transform: translate(0, 50%) !important;
  -ms-transform: translate(0, 50%) !important; /* IE 9 */
  -webkit-transform: translate(0, 50%) !important; /* Safari and Chrome */
}

and add this css class to the "modal-dialog" container

<div class="modal-dialog modal-vertical-centered">
...

jsFiddle working example : http://jsfiddle.net/U4NRx/

Answer 5

To make Modal verically Align Middle All dialog.

/* Note:

1.Even you don't need to assign selector , it will find all modal from the document and make it vertically middle

2.To avoid middle some specific modal to be it center you can use :not selector in click event

*/

 $( "[data-toggle='modal']" ).click(function(){
     var d_tar = $(this).attr('data-target'); 
     $(d_tar).show();   
     var modal_he = $(d_tar).find('.modal-dialog .modal-content').height(); 
     var win_height = $(window).height();
     var marr = win_height - modal_he;
     $('.modal-dialog').css('margin-top',marr/2);
  });

From Milan Pandya

Answer 6

Based on Arany's answer, but also accounting for page scroll.

(function($) {
    "use strict";
    function positionModals(e) {
        var $this = $(this).css('display', 'block'),
            $window = $(window),
            $dialog = $this.find('.modal-dialog'),
            offset = ($window.height() - $window.scrollTop() - $dialog.height()) / 2,
            marginBottom = parseInt($dialog.css('margin-bottom'), 10);

        $dialog.css('margin-top', offset < marginBottom ? marginBottom : offset);
    }

    $(document).on('show.bs.modal', '.modal', positionModals);

    $(window).on('resize', function(e) {
        $('.modal:visible').each(positionModals);
    });
}(jQuery));