Divi Theme: Body Class "mobile_nav-opened" hinzufügen, nachdem mobiles Menü geöffnet wird

//#region Add body class when mobile nav is opened
const mob_nav = document.getElementsByClassName('mobile_nav')[0];
console.log(mob_nav);

// Toggle mobile nav on click
mob_nav.addEventListener('click', function() {
	document.getElementsByTagName('body')[0].classList.toggle('mobile_nav-opened');
});

// Close mobile nav with ESC key
document.addEventListener('keydown', function(event) {
	if (event.key === 'Escape') {
		if (mob_nav.classList.contains('opened')) {
			let mobile_nav_button = mob_nav.getElementsByClassName('mobile_menu_bar_toggle')[0];
			mobile_nav_button.click();
		}
	}
});
//#endregion Add body class when mobile nav is opened