title: Search box like w3schools.com
body: <p>I want to make a simple searchbox in my website. I think for my situation, the best way is to use something like w3schools.com did. When user types smth and press enter it redirects to google.com/search  and it will search from only w3schools.com  in google because there is site:www.w3schools.com is given in url. how can i do that?</p>