function hides(){
let popUp = document.querySelector('.popUp');
popUp.style.display ="flex";
function hidden() {
popUp.style.display ="none";
}
let step;
function countdown(){
let number = document.querySelector('b');
if (parseInt(number.innerHTML) == 0){
step=3;
clearInterval(myInterval)
} else {
step = parseInt(number.innerHTML) - 1;
}
number.innerHTML = step;
number = null;
step = null;
}
setTimeout(hidden, 3000);
let myInterval = setInterval(countdown, 1000);
}
let input = document.querySelector('input');
input.addEventListener("click", hides);