css - 样式化 PayPal 下拉菜单

Question

我正在尝试自定义 PayPals 按钮和下拉菜单的外观，但我不知道如何设置下拉菜单的样式？这甚至可以做到吗？

<form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="BNG39UCNQW5YE">
<table>
<tr><td><input type="hidden" name="on0" value="SIZES"></td></tr><tr><td><select name="os0">
    <option value="SMALL">SMALL </option>
    <option value="MEDIUM">MEDIUM </option>
    <option value="LARGE">LARGE </option>
</select> </td></tr>
</table>
<input type="image" src="http://www.dwste.com/images/buy_btn_pink.png" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>

http://jsfiddle.net/craigzilla/LRr5K/

有任何想法吗？