function isMobileDevice() {
    return /Mobi|Android|iPhone|iPad|iPod|Windows Phone/i.test(navigator.userAgent);
}

(()=>{

    let demoButton = document.getElementById("demo-btn");
    if(demoButton) demoButton.addEventListener('click', () => {

        if (isMobileDevice()) {
            alert("Please use desktop for demo")
        } else {
            window.location.href = "/register"
        }
    })

    

})();