diff --git a/projet_tkinter_sujet5.py b/projet_tkinter_sujet5.py
index 6492eab..875a6af 100644
--- a/projet_tkinter_sujet5.py
+++ b/projet_tkinter_sujet5.py
@@ -14,14 +14,20 @@ if indice_couleur == 3 :
 if indice_couleur == 4 :
     couleur = "grey"
 
-taille = randint(10, 31)
+taille = randint(10, 30)
 position_x = randint(0, 400)
 position_y = randint(0, 300)
+while position_x+taille > 400 or position_y+taille > 300:
+    taille = randint(10, 31)
+    position_x = randint(0, 400)
+    position_y = randint(0, 300)
+
 fenetre = tk.Tk()
 
 canva = tk.Canvas(fenetre, width = 400, height = 300, bg = "white")
 canva.grid()
 
-rectangle = canva.create_rectangle(position_x, position_y, position_x+taille, position_y+taille, fill = couleur)
+rectangle = canva.create_rectangle(position_x, position_y, position_x+taille,
+                                   position_y+taille, fill = couleur)
 
 fenetre.mainloop()
\ No newline at end of file