Inténtalo tú mismo - jQuery eff_animate

<!DOCTYPE html>
<html>
<head>
<script src="/lib/jquery-1.12.2.min.js"></script>
<script>
$(document).ready(function(){
  // Add smooth scrolling to all links
  $("a").on('click', function(event) {

// Prevent default anchor click behavior
    event.preventDefault();

// Store hash
    var hash = this.hash;

// Using jQuery's animate() method to add smooth page scroll
    // The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
    $('html, body').animate({
      scrollTop: $(hash).offset().top
    }, 800, function(){
   
      // Add hash (#) to URL when done scrolling (default click behavior)
      window.location.hash = hash;
    });
  });
});
</script>
 <style>
body, html, .main {
    height: 100%;
}

section {
    min-height: 100%;
}
</style>
</head>
<body>

<a href="#section2">Click Me to Smooth Scroll to Section 2 Below</a>

</body>
</html>