var modal = document.getElementById('myModal');
var btn = document.getElementById("myBtn");
var span = document.getElementsByClassName("close")[0];
btn.onclick = function () {
modal.style.display = "block";
modal.style.display = "block";
}
span.onclick = function () {
modal.style.display = "none";
}
window.onclick = function (event) {
if (event.target == modal) {
modal.style.display = "none";
}
}