CSS can provide some basic control of scrolling content, which you
can use to good effect. In the atmospheric Retro Theater sample on the CSS
Zen Garden website (Figure 3-1), the main website
content within the cinema screen is surrounded by
elements that contain the cinema architecture images. As the user
moves the browser’s vertical scroll bar, the main website content within
the cinema screen (the viewport) is transformed into what appears to be
black-and-white movie credits that move vertically.