There is not currently a way to add styling to our module, however, after doing some testing and research, I found this handy little plugin that will allow you to install any module in a Joomla Custom HTML module and possibly add your own styling around our module:
http://www.nonumber.nl/extensions/modulesanywhere
(fyi, the
{ loadposition } module will not work)
This is an example of what you can do:
This is the sample code I used to create the above:
<div style="border: 1px solid blue;color:red;background-color:#e2e2e2;padding:3px;">Any additional text goes here, and additional styling... <br />
{module 57}</div>
So as you can see, you should be able to end up with similar looking signup that you have on your clients website.