<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body{
	background:#666;
}
.test{
	background:none;
}
</style>
</head>
<body>
  <select class="test">
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
</select>
</body>
</html>