"if I were launching a new website, here's what I'd do. Instead of hiding the Feedback link in the upper right hand corner, I'd place a form right on the main page. A big form. And I'd bend over backwards to get people to use it."
The thank-you page isn't really code, so even though it might be hundreds of lines of HTML and CSS, it's the web designer's responsibility, not the coder's. :)
The code for the thank-you page could be as simple as:
What are the two lines of code to produce this?