Script:

jQuery(document).ready(function( $ ) {
const marginTop = 120;
const speed = 600;
const primaryMenu = "#primary-menu";
$(primaryMenu + " a").click(function (event) {
var link = $(this).attr("href");
if (link.indexOf("#") != -1) {
event.preventDefault();
var splitLink = link.split("#");
var id = splitLink[1];
if (id == "") {
$('html, body').animate({scrollTop: ((0))}, speed);
} else if ($("#" + id).length) {
$('html, body').animate({scrollTop: (($("#" + id).offset().top - marginTop))}, speed);
}
}
});
});