Floor Ad
The Mobile Floor Ad is suitable for getting people to notice the advertisement quick and without taking up too much of screen real estate. With the expanded format you can also intecrate a video inside the ad unit. Making it a good way to get people to see your clip.
To get as many people to expand the creative, then always think of a good CTA. This will ensure most people will see the intended expand part.
Expand and Close button styles are not allowed to be customized.