Contact form doesn’t send the message

Hello friends,

I have two doubts:

1- The two contact forms that I have in my page doesn’t work. When I send the message, return the error message “There was an error with your request your message. Try again later.” I don’t know the color of error because I change all the colors of my template. And I really do the stmp config.

2- One contact form I need that have be the white color, but the other I need that have the black color. I maked two differents forms, but the CSS codes is the same, so when I change the color, the two forms change too, not only one. How I can solve it?

Thank you!!

The page I need help with: [log in to see the link]