var firstSlide = document.querySelector('.item:firest-child');
firstslide.classList.add('show');
function slide() {
var currentSlide = document.querySelector('.show');
if(currentSlide){
currentSlide.classList.remove('show');
var nextSlide = currentSlide.nextElementsibling;
if(nextSlide){
nextSlide.classList.add("show");
}else{
firstSlide.classList.add('show');
}
}else{
firstSlide.classList.add('show');
}
}
slide();
setInterval(slide,2000);