Change size of Drag and Drop Box

Can someone help me understand how to change the sizing of the drag and drop boxes. I am going to use the stacking option for both the choices and once they are dragged over to the box. Therefore, the boxes don't need to be so large. This will also improve it's usage on the iphone since the current format isn't working properly when you need to drag below the current screen area. (I have already notified engineering) I am not a coder, but I usually can find my way around the java script area. Thank you