this is my js to open and close sidenav with id="mySidenav".

 function openNav() {
  document.getElementById("mySidenav").style.width = "250px";
}

function closeNav() {
  document.getElementById("mySidenav").style.width = "0";
}

How to close the sidenav on clicking outside the sidenav and also when screen size is >600px?