Untitled

const button = document.querySelectorAll('.add');
const btn = document.querySelectorAll('.remove');
const counter = document.getElementById('counter');

let count = 0;

button.forEach(button => {
  button.addEventListener('click',function(){
    count += 1;
    counter.textContent = count;
    alert('Item added to cart');
  });
});

btn.forEach(btn =>{
  btn.addEventListener('click', function(){
    if(count>0){
      count -=1;
      counter.textContent = count;
    }else{
      alert('your cart is empty');
    }
    alert('Item is remove from cart');
  });
});