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<!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">&times;</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>
// Get the modal
var modal = document.getElementById('id01');
// When the user clicks anywhere outside of the modal, close it