The w3-animate-fading class animates an element in and out (takes about 5 seconds).
var myIndex = 0;
carousel();
function carousel() {
var i;
var x = document.getElementsByClassName("mySlides");
for (i = 0; i x.length) {myIndex = 1}
x[myIndex-1].style.display = "block";
setTimeout(carousel, 5000);
...
