var inverval_timer;

//Time in milliseconds [1 second = 1000 milliseconds ]    
inverval_timer = setInterval(function() { 
    const burgerMenu = document.querySelector('div.MobileNav>div')
    const nav = document.querySelector('div.MobileNav>div+nav.Mobile')

    
    if (window.innerWidth != burgerMenu.clientWidth) {
        console.log('Off');
        nav.style.display = 'none';
    }
    else if(window.innerWidth <= burgerMenu.clientWidth) {
        console.log('On');
        nav.style.display = 'flex';
    }
}, 100);