I want to style your form to look like the one I am using here:

http://kiplingsgaragebar.com.au/contact/

Can you provide Custom CSS I can put into my theme so that it displays like this?
I am using form on the page http://tangiblestaging.com/responsive-web-design/, (not in pop-up).

I also don’t want it to go 100% width. Maybe around 70% width and submit button same as other buttons on page.

I need to make sure that it will still resize properly for mobiles.
Appreciate the help