Try adding a alignParentBottom option to the transparent panel.
As Konstantin pointed out use layout_alignParentBottom to position the button at the bottom of your view. The problem now is that the mapview will also stretch itself out to the bottom of the parent. Therefore the mapview will ´grow´ under the button until the parent is filled.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.