jQuery smooth scroll to # links

main.js

$(document).ready(function() {
  $("a[href^='#']").on("click", function(event) {
    event.preventDefault();
    var target = this.hash,
    $target = $(target);
    $("html, body").stop().animate({
      "scrollTop": $target.offset().top
    }, 900, "swing", function() {
      window.location.hash = target;
    });
  });
});