rosewarnegardendesigns on "[Theme: PageLines] MAILCHIMP SUBSSCRIBE BUTTON almost invisible"

I just installed a Mailchimp widget to allow subscribers to subscribe to a newsletter/blog.

The background color on the SUBSCRIBE button should be dark grey wih white writing but it's pale grey with white lettering so almost invisible.

There is no obvious route to change the colour in the code, is there something in Pagelines/WOrdpress that can effect the background colour of this button to be dark grey.

Thanks in advance

http://www.rosewarnegardens.com