Enter PIN img.site-navigation { display: block; border: 1px solid #336; margin-top: 1em; padding: 1em } This example emulates a very simple ATM machine and shows how to declare the site navigation logic in the Page Flow Controller configuration. The site navigation logic is this way kept separate from the pages themselves, thus achieving a better separation of concerns. The diagram on the right exposes the logic of the ATM. Each page in this application is very simple and the interesting part lies in the navigation logic between pages. Invalid PIN The PIN is: 42 Access Account submit