An ad format is a Top page banner with two panels - initial and fullscreen. The fullscreen panel appears automatically only one time per user within the browser session. The next time it appears on mouseover after the 3-to-1 countdown finishes. The fullscreen panel can be also called on Click to expand button click. On Close buton click the fullscreen panel closes. The color of a fullscreen background can be changed.
The standard size of the initial panel is 728x90.