Bootstrap 3 - set height of modal window according to screen size

Question

I am trying to create a kind of responsive megamenu using Bootstrap 3 modal dialog. I would like to set the width and height of the whole modal window to 80% of the viewport

Answer 1

To expand on Ryand's answer, if you're using Bootstrap.ui, this on your modal-instance will do the trick:

    modalInstance.rendered.then(function (result) {
        $('.modal .modal-body').css('overflow-y', 'auto'); 
        $('.modal .modal-body').css('max-height', $(window).height() * 0.7);
        $('.modal .modal-body').css('height', $(window).height() * 0.7);
    });