pageAlignVertically : boolean
When enabled the Display canvas will be vertically-aligned in the Parent container (or window). To align vertically the Parent element should have a non-collapsible height, such that it will maintaina height larger than the height of the contained Game canvas - the game canvas will then be scaled verticallywithin the remaining available height dictated by the Parent element. One way to prevent the parent from collapsing is to add an absolute "min-height" CSS prop