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<html lang="ja">
<head>
<title>皇居</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="leaflet.css" /> <!-- (1) -->
<script src="leaflet.js"></script>
<style type="text/css">
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div#mymap {width: 90vw; height: 80vh; margin: 0 auto;} /* (2) */
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</style>
</head>
<body>
<h1>皇居を中心に半径5キロ</h1>
<div id="mymap"></div> <!-- (3) -->
<!-- #mymap であるdivを配置したあとで (4) -->
<script type="text/javascript" src="koukyo.js" charset="utf-8"></script>
</body>
</html>
