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body.modal-open {
   overflow: hidden;
   position: fixed;
}
.reveal-modal {
   overflow-y: auto;
   height: 100%;
   position: fixed;
}

$(".reveal-modal").on("open", function () {
    $("body").addClass("modal-open");
});
$('.close-reveal-modal').bind("click touchstart", function () {
    $('body').removeClass('modal-open');
});