Use more debug-friendly geometry & Print geometry

transparent.py

@@ -40,8 +40,16 @@ class TestWin(Gtk.Window):
 
     def make_fullscreen(self):
         geo = self.get_screen_size(self._default_monitor)
-        self.move(geo.x, geo.y)
-        self.resize(geo.width, geo.height)
+        scale = (1.05, 6)
+        x, y, w, h = (
+            geo.x + geo.width / 2 - geo.width / scale[0] / 2,
+            geo.y,
+            geo.width / scale[0],
+            geo.height / scale[1],
+        )
+        self.move(x, y)
+        self.resize(w, h)
+        print(f"geometry: @{x:.0f},{y:.0f} {w:.0f}x{h:.0f}")
 
     def get_screen_size(self, monitor):
         return self.get_screen().get_monitor_geometry(monitor)