As interstitial advertisement we provide a solution where the client provides a banner with a fixed ratio - we provide positioning and close functionality. The advertisement is placed on the screen at its maximum size relative to the screen size. This way advertisement design does not need to take into account the many different device ratios.
The banner does not change ratio based on device orientation. It is possible to create landscape and portrait views as different banners and target them based on device type (e.g mobile, tablet or desktop) but it is not possible to target based device orientation.
Close button and autoclose time counter styles cannot be customized.