diff --git a/src/gui_starfield.py b/src/gui_starfield.py
index 5dcd418..f49e951 100644
--- a/src/gui_starfield.py
+++ b/src/gui_starfield.py
@@ -28,10 +28,10 @@ class StarField:
         self.center_y = height / 2
         self.circular_mask_radius = min(self.center_x, self.center_y) * 0.95
         if isDark:
-            self.canvas = Canvas(master, width=width, height=height, bg="#111111")
+            self.canvas = Canvas(master, width=width, height=height, bg="#111111", highlightthickness=0)
             self.canvas.pack()
         else:
-            self.canvas = Canvas(master, width=width, height=height, bg="#FFFFFF")
+            self.canvas = Canvas(master, width=width, height=height, bg="#FFFFFF", highlightthickness=0)
             self.canvas.pack()
 
         # Create a black circle as the background