Smooth Scroll all has links

//Make all links that starts with hash smooth scroll to that div.
jQuery(document).ready(function(){
  jQuery('a[href^="#"]').on('click', function(event) {
    event.preventDefault();
    var hash = this.hash;
    jQuery('html, body').animate({
      scrollTop: jQuery(hash).offset().top
    }, 800, function(){
      window.location.hash = hash;
    });
  });
});