Correct some bugs in Qt (C++)app

I have a simple puzzle game. There is 2 problems when I try to interact with puzzle pictures: 1) The piece of puzzle is picked only in red area (like in the photo). I need it to be picked within right inside of edges. 2) When dragging a piece of a puzzle to the edge of the widget(which is on right), it disappears Need these problems to be fixed within 24 hours.