INDEX.HTML
<html>
<head>
<title>Info Windows</title>
</head>
<body>
<div id="map"></div>
<script
src="https://maps.googleapis.com/maps/api/js?key=INSERT_YOUR_API_KEY&callback=initMap&v=weekly"
defer
></script>
</body>
</html>
STYLE.CSS
#map {
height: 100%;
}
html,
body {
height: 100%;
margin: 0;
padding: 0;
}