<script>
function openNav() {
var sidenav = document.getElementById("mySidenav"),
main = document.getElementById("main");
sidenav.style.width = sidenav.style.width == "250px" ? '0' : '250px';
main.style.marginLeft = main.style.marginLeft === "250px" ? '0' : '250px';
}


function myFunction(x) {
x.classList.toggle("change");
}
var main = document.getElementById("main");
main.addEventListener("click", function() {
var sidenav = document.getElementById("mySidenav");
if (sidenav.style.width === "250px") {
sidenav.style.width = "0";
main.style.marginLeft = "0";
}
});


</script>