jQuery modal form

ModalForm

HTML:

<a class="js-open-modal" href="#" data-modal-id="popup">Click Me</a>

<div id="popup" class="modal-box">
    <header>
        <a href="#" class="js-modal-close close">×</a>
        <h3><a href="http://www.jqueryscript.net/tags.php?/Modal/">Modal</a> Title</h3>
    </header>
    <div class="modal-body row">
        <div class="col-md-6">
            Modal Body Col 1
        </div>
        <div class="col-md-6">
            Modal Body Col 2
        </div>
    </div>
    <footer>
        <a href="#" class="js-modal-close">Close Button</a>
    </footer>
</div>



CSS:
.modal-box {
    display: none;
    position: absolute;
    z-index: 1000;
    width: 98%;
    background: white;
    border-bottom: 1px solid #aaa;
    border-radius: 4px;
    box-shadow: 0 3px 9px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(0, 0, 0, 0.1);
    background-clip: padding-box;
}

.modal-box header,
.modal-box .modal-header {
    padding: 1.25em 1.5em;
    border-bottom: 1px solid #ddd;
}

.modal-box header h3,
.modal-box header h4,
.modal-box .modal-header h3,
.modal-box .modal-header h4 {
    margin: 0;
}

.modal-box .modal-body {
    padding: 2em 1.5em;
}

.modal-box footer,
.modal-box .modal-footer {
    padding: 1em;
    border-top: 1px solid #ddd;
    background: rgba(0, 0, 0, 0.02);
    text-align: right;
}

.modal-overlay {
    opacity: 0;
    filter: alpha(opacity=0);
    position: absolute;
    top: 0;
    left: 0;
    z-index: 900;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3) !important;
}

a.close {
    line-height: 1;
    font-size: 1.5em;
    position: absolute;
    top: 5%;
    right: 2%;
    text-decoration: none;
    color: #bbb;
}

a.close:hover {
    color: #222;
    -webkit-transition: color 1s ease;
    -moz-transition: color 1s ease;
    transition: color 1s ease;
}

@media (min-width: 768px) {
  .modal-box { width: 768px; }
}



JavaScript:
$(function () {

    var appendthis = ("<div class='modal-overlay js-modal-close'></div>");

    $('a[data-modal-id]').click(function (e) {
        e.preventDefault();
        $("body").append(appendthis);
        $(".modal-overlay").fadeTo(500, 0.7);
        //$(".js-modalbox").fadeIn(500);
        var modalBox = $(this).attr('data-modal-id');
        $('#' + modalBox).fadeIn($(this).data());
    });

    $(".js-modal-close, .modal-overlay").click(function () {
        $(".modal-box, .modal-overlay").fadeOut(500, function () {
            $(".modal-overlay").remove();
        });
    });

    $(window).resize(function () {
        $(".modal-box").css({
            top: ($(window).height() - $(".modal-box").outerHeight()) / 2,
            left: ($(window).width() - $(".modal-box").outerWidth()) / 2
        });
    });

    $(window).resize();

});



Source:
http://www.jqueryscript.net/lightbox/Super-Simple-Modal-Popups-with-jQuery-CSS3-Transitions.html