window.onscroll = function() {  stickymenu();}
/* Add Stuck class to header, used for various sticky effects */
var headerclass = document.getElementsByClassName('header-container-wrapper');
var stickyheader = headerclass[0];  
var sticky = stickyheader.offsetTop;
function stickymenu() {
if (window.pageYOffset > sticky) {
stickyheader.classList.add("stuck");
} else {
stickyheader.classList.remove("stuck");
}
}