Test Page
<!DOCTYPE html>
<html>
<head>
<title>Add Map</title>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script src="./index.js"></script>
</head>
<body>
<h3>My Google Maps Demo</h3>
<!--The div element for the map -->
<div id="map"></div>
<!-- Async script executes immediately and must be after any DOM elements used in callback. -->
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
async
></script>
</body>
</html>