let overlay = document.querySelector('.overlay'),
close = document.querySelector('.popup-close');

document.addEventListener('click', function(event) {
    let target = event.target;

    if (target.className == 'description-btn' || target.className == 'more')
    {
        target.classList.add('more-splash');
        overlay.style.display = "block";
        document.body.style.overflow = 'hidden';
    }

    if (target.className == 'popup-close') {

    target.classList.remove('more-splash');
    overlay.style.display = "none";
    document.body.style.overflow = '';
    }