scroll.js

$(document).ready(function() {
            // Add smooth scrolling to all links in navbar + footer link
            $("#sidenav a").on('click', function(event) {
                // Make sure this.hash has a value before overriding default behavior
                if (this.hash !== "") {
                    // 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 (900) specifies the number of milliseconds it takes to scroll to the specified area
                    $('html, body').animate({
                        scrollTop: $(hash).offset().top
                    }, 300, function() {

                        // Add hash (#) to URL when done scrolling (default click behavior)
                        window.location.hash = hash;
                    });
                } // End if
            });
        });