Как закрыть pop-up на мобильном кнопкой "назад" в Tilda

<script>
if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|BB|PlayBook|IEMobile|Windows Phone|Kindle|Silk|Opera Mini/i.test(navigator.userAgent)) {

let popupOpen = false;
let openLink = "#popup";

if(document.location.hash==openLink) document.location.hash='';

let bodyMode = document.querySelector('.t-body');
let observer = new MutationObserver(function (mutations) {
    mutations.forEach(function (mutation) {
        setTimeout(function(){
            if (bodyMode.classList.contains('t-body_popupshowed')) {
                
                let path = window.location.pathname;
                

                if(  (window.location.hash=="" &&  !path.includes('/tproduct/') ) || window.location.hash.includes('/tproduct/') ) {
                    window.location.hash = openLink;
                    popupOpen=true;
                };
                
            }else{
            //    if(window.location.hash == openLink ) history.pushState("", document.title, window.location.pathname);
            };
            
        }, 100);
    });
});
observer.observe( bodyMode, {  attributes: true, attributeFilter: ['class'] });
    
window.addEventListener("hashchange", function(){
   
    let hash = window.location.hash;
    
    if ( hash!=openLink && popupOpen &&  bodyMode.classList.contains('t-body_popupshowed') ){
        let popUpOpn = document.querySelector(".t-popup_show .t-popup__close");
        if(popUpOpn)   popUpOpn.click();

    };
});  

};
</script>