How do I style the Contact Form

Here is the page I'm working on...

http://www.collegestudentpressurewashing.com/cspw/

I would like the Subject, Email, and Message fields to run full width.

And, I'd like to change the background color and text color of the "Send Message" box.

Finally, when I click on "View All Activity" in my control panel for WPMU I get an error message.

TIA