[Plugin: Contact Form 7] Styling of submit button

Is there any build in way to style the Submit button?

At the moment it’s an ugly grey square button, like a very standard Submit button. But my whole site has a style, every button has a style. So I want this button to have a style.

(a bit astonished to see that it doesn’t come with any build in styling… none at all as far is a can tell….).

I’ve tried a few codes in the text-area where the contactform shortcodes are, but they don’t work.
Do I really have to open the plugins PHP files to edit it? Because that would get overwritten with the next update…

Besides moaning and complaining, i’d like to thank you. Your plugin makes it much easier to insert a contactform. And all of that for free. Kuddo’s.

Sincerely, Vinnie.

http://wordpress.org/extend/plugins/contact-form-7/