text: var nav = document.querySelector('nav');
  var imgNav = document.getElementById('imgNav');
  var li = document.querySelector("#navbarSupportedContent > ul > li:nth-child(1) > a");
  var li2 = document.querySelector("#navbarSupportedContent > ul > li:nth-child(2) > a");
  var li3 = document.querySelector("#navbarSupportedContent > ul > li:nth-child(3) > a");
  var li4 = document.querySelector("#navbarSupportedContent > ul > li:nth-child(4) > a");
  var li5 = document.querySelector("#navbarSupportedContent > ul > li:nth-child(5) > a");
  
        
      window.addEventListener('scroll', function () {
              if (window.pageYOffset > 130) {
                  nav.classList.add('bg-white', 'shadow');
                  nav.style.transition = "all 0.8s";
  
                  imgNav.setAttribute('src', 'images/logo-simple.png')
                  imgNav.setAttribute('width', '240px')
                  imgNav.style.transition = "all 1s";
  
                  li.style.color = "black";
                  li2.style.color = "black";
                  li3.style.color = "black";
                  li4.style.color = "black";
                  li5.style.color = "black";
  
              } else {
                  nav.classList.remove('bg-white', 'shadow');
                  nav.style.transition = "all 0s";
  
                  imgNav.setAttribute('src', 'images/logo-papillonT.png');
                  imgNav.setAttribute('width', '200px')
                  imgNav.style.transition = "all 1s";
                  
                  li.style.color ="white";
                  li2.style.color ="white";
                  li3.style.color ="white";
                  li4.style.color ="white";
                  li5.style.color ="white";
              }
          });
  
  
  
  function aviso(){
      alert("Nossa Loja Virtual está em manutenção. Pedimos desculpas pelo transtorno.")
  }
  