CSS for Affiliates Shortcodes

I installed the Affiliates plugin and started doing some testing this evening for a client. I set up an "Affiliates" page and used the two shortcodes:
[affiliatelogincheck]

[affiliateuserdetails]

To allow a user to sign-up for an affiliate account. However. even though my website has a black background on the inner section and a white text on it, the plugin shortcodes only use the body text color (white) and use what appears to be a standard white or pinkish-white background.

I looked in the plugin files and there's no CSS that I can find.

Any help would be greatly appreciated.

Thanks.

James Dunn
Athens, GA USA