-let modal, hiding;
+let modal, backdrop, hiding;
function show_modal () {
modal.classList.remove('hidden');
+ backdrop.classList.remove('hidden');
setTimeout(function (){
document.body.classList.add('modal-open');
}, 20);
$(function() {
modal = $('.modal')[0];
+ backdrop = $('.backdrop')[0];
$(modal).on('transitionend', el => {
if(!document.body.classList.contains('modal-open'))
modal.classList.add('hidden');