Create Animated Tab Content ( CSS JS)

<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">
<style>
.city {display:none;}
</style>
<body>

<nav class="w3-sidenav w3-black w3-card-2" style="width:130px">
  <div class="w3-container">
    <h5>Menu</h5>
  </div>
  <a href="#" class="tablink" onclick="openCity(event, 'London')">London</a>
  <a href="#" class="tablink" onclick="openCity(event, 'Paris')">Paris</a>
  <a href="#" class="tablink" onclick="openCity(event, 'Tokyo')">Tokyo</a>
</nav>

<div style="margin-left:130px">
  <div class="w3-padding">Use any of the w3-animate-classes to fade, zoom or slide in tab content. Click on the links.</div>

  <div id="London" class="w3-container city w3-animate-left">
    <h2>London</h2>
    <p>London is the capital city of England.</p>
    <p>It is the most populous city in the United Kingdom, with a metropolitan area of over 13 million inhabitants.</p>
  </div>

  <div id="Paris" class="w3-container city w3-animate-opacity">
    <h2>Paris</h2>
    <p>Paris is the capital of France.</p>
    <p>The Paris area is one of the largest population centers in Europe, with more than 12 million inhabitants.</p>
  </div>

  <div id="Tokyo" class="w3-container city w3-animate-zoom">
    <h2>Tokyo</h2>
    <p>Tokyo is the capital of Japan.</p>
    <p>It is the center of the Greater Tokyo Area, and the most populous metropolitan area in the world.</p>
  </div>

</div>

<script>
function openCity(evt, cityName) {
  var i, x, tablinks;
  x = document.getElementsByClassName("city");
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";
  }
  tablinks = document.getElementsByClassName("tablink");
  for (i = 0; i < x.length; i++) {
     tablinks[i].className = tablinks[i].className.replace(" w3-red", "");
  }
  document.getElementById(cityName).style.display = "block";
  evt.currentTarget.className += " w3-red";
}
</script>

</body>
</html>