Leaflet 0.7.5

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="//cdn.leafletjs.com/leaflet-0.7.5/leaflet.css" />
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div id="leaflet"></div>
    <script type="text/javascript" src="//cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>
    <script type="text/javascript" src="script.js"></script>
  </body>
</html>

var map = new L.Map('leaflet', {
  'center': [0, 0],
  'zoom': 1,
  'minZoom': 1,
  'maxBounds': [
    [90,-180],
    [-90, 180]
  ],
  'layers': [
    L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
      attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>',
      noWrap: true
    })
  ]
})

body {
  margin: 0;
}

#leaflet {
  width: 512px;
  height: 512px;
}