text: 
  const btnMobile = document.getElementById ('btn-mobile');
  
  function toggleMenu(event) {
   if (event.type === 'touchstart') event.preventDefault();
   const nav = document.getElementById ('nav');
   nav.classList.toggle('active');
   const active = nav.classList.contains('active');
   event.currentTarget.setAttribute('aria-expanded', active);
   if(active) {
      event.currentTarget.setAttribute('aria-label','Fechar menu');
   } else {
      event.currentTarget.setAttribute('aria-label','Abrir menu');
   }
  }
  
  
  btnMobile.addEventListener('click', toggleMenu);
  btnMobile.addEventListener('touchstart', toggleMenu);