<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>
<div class="w3-container">
<h2>W3.CSS Modal</h2>
<p>In this example we demonstrate how to close the modal by clicking outside of the modal box.</p>
<button onclick="document.getElementById('id01').style.display='block'" class="w3-button w3-black">Open Modal</button>
<div id="id01" class="w3-modal">
<div class="w3-modal-content w3-card-4">
<header class="w3-container w3-teal">
<span onclick="document.getElementById('id01').style.display='none'"
class="w3-button w3-display-topright">×</span>
<h2>Modal Header</h2>
</header>
<div class="w3-container">
<p>You have two options to close this modal:</p>
<p>Click on the "x" or click anywhere outside of the modal!</p>
</div>
<footer class="w3-container w3-teal">
<p>Modal Footer</p>
</footer>
</div>
</div>
</div>
<script>
var modal = document.getElementById('id01');