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$('.modal').addClass('modal-wide');
$(".modal-wide").on("show.bs.modal", function() {
  var height = $(window).height() - 200;
  $(this).find(".modal-body").css("max-height", height);
});

.modal.modal-wide .modal-dialog {
  width: 90%;
}
.modal-wide .modal-body {
  overflow-y: auto;
}