[Feature request] Please add unique class or id to Paypal button div

Hi,

So, right now the plugin renders the button section like:

<div>
  <label>Test test</label>
  <br />
  <form target='_blank' action='https://www.paypal.com/cgi-bin/webscr' method='post'>
     ...
  </form>
</div>

but there’s not really a way to access this section (either by id or class) on a page to do styling, etc.

It would be great if you’d add a unique id or class to the rendered section <div>.