How do I set up the themes of buttons?

The background of the buttons seem to be the following.
http://www.flickr.com/photos/94850915@N03/8639997558/in/photostream

code:
<LINK REL='Stylesheet' HREF='http://code.jquery.com/ui/1.10.2/themes/cupertino/jquery-ui.css'&gt;
<style type="text/css" title="currentStyle">
@import "/DataTablesdemo_page.css";
@import "/DataTables/demo_table.css";
@import "/DataTables-1.9.4/extras/TableTools/media/css/TableTools.css";
@import "/DataTables-1.9.4/extras/ColReorder/media/css/ColReorder.css";

.DTTT_container {
/*display: none;
float: right;*/
margin-top: 3px;
}

<script type="text/javascript" src="DataTablesBMD/jquery-1.9.1.js"></script>
<script type="text/javascript" language="javascript" src="DataTables-1.9.4/media/js/jquery.dataTables.js"></script>
<script type="text/javascript" language="javascript" src="DataTables-1.9.4/extras/ColReorder/media/js/ColReorder.min.js"></script>
<script type="text/javascript" charset="utf-8" src="/DataTables-1.9.4/extras/TableTools/media/js/ZeroClipboard.js"></script>
<script type="text/javascript" charset="utf-8" src="/DataTables-1.9.4/extras/TableTools/media/js/TableTools.js"></script>