diff --git a/engine/sdl2.py b/engine/sdl2.py
index 5a1f982..4f7e416 100644
--- a/engine/sdl2.py
+++ b/engine/sdl2.py
@@ -14,7 +14,7 @@ class GameWindow:
         self.cell_size = cell_size
         self.width = width * cell_size
         self.height = height * cell_size
-        actual_screen_size = os.environ.get("RESOLUTION", "640x480").split("x")
+        actual_screen_size = os.environ.get("RESOLUTIONz", "640x480").split("x")
         actual_screen_size = tuple(map(int, actual_screen_size))
         self.target_size = actual_screen_size if self.width > actual_screen_size[0] or self.height > actual_screen_size[1] else (self.width, self.height)
         self.w_start_offset = (self.target_size[0] - self.width) // 2
@@ -89,8 +89,7 @@ class GameWindow:
         self.renderer.copy(sprite, dstrect=sprite.position)
         
     def draw_background(self, bg_texture):
-        self.renderer.copy(bg_texture, dstrect=sdl2.SDL_Rect(0, 0, self.width, self.height))
-
+        self.renderer.copy(bg_texture, dstrect=sdl2.SDL_Rect(self.w_offset, self.h_offset, self.width, self.height))
     def draw_image(self, x, y, sprite, tag, anchor="nw"):
         if not self.is_in_visible_area(x, y):
             return
@@ -190,7 +189,8 @@ class GameWindow:
                     
                     
             # Disegna qui gli sprite
-            #sdl2.SDL_RenderSetClipRect(self.renderer.sdlrenderer, sdl2.SDL_Rect(self.w_offset, self.h_offset, self.target_size[0], self.target_size[1]))
+            #rect = sdl2.SDL_Rect(self.w_offset, self.h_offset, self.target_size[0], self.target_size[1])
+            #sdl2.SDL_RenderSetClipRect(self.renderer.sdlrenderer, rect)
             self.renderer.present()
             self.performance = (sdl2.SDL_GetPerformanceCounter() - performance_start) / sdl2.SDL_GetPerformanceFrequency() * 1000
             if self.performance < self.delay: