Change the border color of a text field in form (in css) – PT II

Hi Skandha,
Sorry for opening a new topic, but somehow my reply won’t show up because of:
ERROR: Duplicate reply detected; it looks as though you’ve already said that.

But anyway, thanks for trying to help me out!
Here’s where the form is:
http://mqdevelop.nl/contact/

And here’s what I want it to (somewhat) look like:
http://www.cuijkswaterspektakel.nl/inschrijven-beachvolley/