The swipe cards within the 300 by 600 standard banner unit. The sizes for stacked card is 240 width and 395 height. There are two options to utilize the spaces on top and the bottom.
OPTION 1 Logo on top and the Call-to-Action button at the bottom.
OPTION 2 Push both the logo and Call-To-Action button under the stacked cards at the bottom.
File Formats JPG, PNG
Full Ad Area: 300px (w) by 600px (h)
Stack Cards: 240px (w) by 395px (h)