diff --git a/src/config/constants.py b/src/config/constants.py
index 8f608ac..14c4b31 100644
--- a/src/config/constants.py
+++ b/src/config/constants.py
@@ -7,6 +7,7 @@ from PySide6.QtGui import QColor
 # ---------------------------------------------------------------------------
 
 NO_STAFF = True
+NO_WHITELIST = True
 
 REDIRECT_URI = "http://localhost:5000/callback"
 SCOPES = ["identify"]
diff --git a/src/main.py b/src/main.py
index 4a5bed0..2c23996 100644
--- a/src/main.py
+++ b/src/main.py
@@ -7,16 +7,18 @@ from PySide6.QtWidgets import QApplication
 
 # Imports pour la gestion de la configuration
 from config.config_manager import ConfigManager
+from config.constants import Resources
 
 # Imports pour la vérification Discord
 from discord.discord_tools import CheckDiscord
+
+# Import pour la partie ui
 from ui.custom_message_box import CustomMessageBox
+from ui.main_window import MainWindow
 
 # Ne pas supprimer ! Enregistre les ressources Qt
 import resources  # noqa: F401 - required to register Qt resources
 
-from ui.main_window import MainWindow
-from config.constants import Resources
 
 # ---------------------------------------------------------------------------
 # Bundle path resolution
diff --git a/src/tools/utils.py b/src/tools/utils.py
index ceb80b9..721d7b4 100644
--- a/src/tools/utils.py
+++ b/src/tools/utils.py
@@ -1,5 +1,6 @@
 import sys
 from pathlib import Path
+from PySide6.QtWidgets import QApplication
 
 PROJECT_ROOT = Path(__file__).resolve().parents[2]
 
@@ -17,3 +18,10 @@ def get_executable_dir() -> Path:
         # sys.executable est le chemin complet vers l'application .exe
         return Path(sys.executable).parent.resolve()
     return Path(__file__).resolve().parents[2]
+
+def quit_application(exit_code: int = 0) -> None:
+    app = QApplication.instance()
+    if app is not None:
+        app.closeAllWindows()
+        app.exit(exit_code)
+    sys.exit(exit_code)
diff --git a/src/ui/main_window.py b/src/ui/main_window.py
index 103d396..53ef5bd 100644
--- a/src/ui/main_window.py
+++ b/src/ui/main_window.py
@@ -12,7 +12,9 @@ from controllers.audio_controller import AudioController
 from controllers.glow_animator import GlowAnimator
 from controllers.window_dragger import WindowDragger
 from discord import discord_oauth
-from config.constants import NO_STAFF, Urls
+from config.constants import NO_STAFF, Urls, NO_WHITELIST
+from ui.custom_message_box import CustomMessageBox
+from tools.utils import quit_application
 
 from fake_patch_notes import patch_note
 
@@ -61,6 +63,18 @@ class MainWindow(QMainWindow):
         self._center_window()
         self.show()
 
+        if NO_WHITELIST:
+            msg = CustomMessageBox(
+                title="La Tanière: Non whitelisté",
+                message="\n\nTu n'est pas whitelisté sur le serveur\n\n"
+                        "Assure-toi de te faire whitelister.\n\n"
+                        "Lorsque cela sera fait, relance le launcher.",
+                icon_type=CustomMessageBox.WARNING,
+                buttons=CustomMessageBox.OK
+            )
+            msg.exec()
+            quit_application()
+
     # ------------------------------------------------------------------
     # Setup
     # ------------------------------------------------------------------
diff --git a/styles/styles.qss b/styles/styles.qss
index 38b0f88..a15623c 100644
--- a/styles/styles.qss
+++ b/styles/styles.qss
@@ -239,7 +239,8 @@ QWidget#MsgBoxMainContainer QLabel,
 QWidget#MsgBoxMainContainer QPushButton
 {
     color: white;
-    font-family: 'Segoe UI';
+    /*font-size: 18px;
+/*    font-family: 'Segoe UI';*/
 }
 
 QPushButton#MsgBoxOkButton,
@@ -283,7 +284,7 @@ QPushButton#MsgBoxCloseButton:hover {
 
 QLabel#MsgBoxTitleLabel {
   font-weight: bold;
-  font-size: 10px;
+  font-size: 14px;
   color: rgba(255,255,255,0.7);
   letter-spacing: 1px;
 }