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Styled Zoom Controls

Customizing the look of UI with CSS
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Styled Zoom Controls</title>
  <script src='http://api.tiles.mapbox.com/mapbox.js/v0.6.7/mapbox.js'></script>
  <link href='http://api.tiles.mapbox.com/mapbox.js/v0.6.7/mapbox.css' rel='stylesheet' />
  <style>
    body { margin:0; padding:0; }
    #map { position:absolute; top:0; bottom:0; width:100%; }
  </style>
</head>
<body>
<style>
/*
These classes override the default styles of the zoom control,
defined in mapbox.css.
You can also omit mapbox.css if you want to style everything from
scratch */
.zoomer {
  background-color:#888;
  border-color:#202020;
  -webkit-border-radius:50%;
          border-radius:50%;
  }
  .zoomer:hover {
    background-color:#666;
    }
.zoomin {
  left:10px;
  }
.zoomout {
  top:45px;
  }
</style>
<div id='map'></div>
<script>
    var map = mapbox.map('map');
    map.addLayer(mapbox.layer().id('examples.hyg-stars'));
    map.ui.zoomer.add();
    map.zoom(3);
</script>
The code and documentation to mapbox.js is hosted on GitHub where you can contribute changes and improvements.