[Plugin: Fast Secure Contact Form] Changing Color of Entire Form?

Hi there:

I see all the numerous options to change colors & customize in every possible way – except I am not seeing how I can change the color of the actual form itself.

I would really like to not have it be this pale gray and instead use have it match the look of my site.

Can I do this? If so where am I putting my color code?

Thanks!!!!