hideMouse.js

(function(){
    var timeout;
    var isHidden = false;

    document.addEventListener("mousemove", function() {
        if (timeout) {
            clearTimeout(timeout);
        }

        timeout = setTimeout(function() {
            if (!isHidden) {
                //document.querySelector("body").style.cursor = "none";
                document.documentElement.classList.add('hiddenMouse');
                isHidden = true;
            }
        }, 1500);

        if (isHidden) {
            //document.querySelector("body").style.cursor = "auto";
            document.documentElement.classList.remove('hiddenMouse');
            isHidden = false;
        }
    });
})();