text: // select modal-btn,modal-overlay,close-btn
  // listen for click events on modal-btn and close-btn
  // when user clicks modal-btn add .open-modal to modal-overlay
  // when user clicks close-btn remove .open-modal from modal-overlay
  
  const modalBtn = document.querySelector('.modal-btn');
  const closeBtn = document.querySelector('.close-btn');
  const modalOverlay = document.querySelector('.modal-overlay');
  
  modalBtn.addEventListener('click', function() {
      modalOverlay.classList.add('open-modal');
  });
  
  closeBtn.addEventListener('click', function() {
      modalOverlay.classList.remove('open-modal');
  });