index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="//cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
<style>
body {
padding: 0;
margin: 0;
}
html, body, #map {
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script src="//cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
<script>
(function() {
var map = L.map('map').setView([40, -97], 5);
L.tileLayer('//{s}.tile.stamen.com/toner-lite/{z}/{x}/{y}.png', {
maxZoom: 12,
attribution: 'Tiles - <a href="//stamen.com">Stamen Design</a> (<a href="//creativecommons.org/licenses/by/3.0">CC BY 3.0</a>). Data - <a href="//openstreetmap.org">OpenStreetMap</a> (<a href="//www.openstreetmap.org/copyright">ODbL</a>).'
}).addTo(map);
})();
</script>
</body>
</html>