diff --git a/src/ui/widgets/config_dialog.py b/src/ui/widgets/config_dialog.py
index cc2d1a5..de813f2 100644
--- a/src/ui/widgets/config_dialog.py
+++ b/src/ui/widgets/config_dialog.py
@@ -52,9 +52,10 @@ class ConfigDialog(QDialog):
 
     def showEvent(self, event):
         super().showEvent(event)
-        # Prendre toute la taille du parent
+        # Plein écran pour masquer l'interface derrière
         if self.parent():
-            self.resize(self.parent().size())
+            self.setGeometry(self.parent().rect())
+        self.setStyleSheet("ConfigDialog { background-color: #f0f0f0; }")
 
     def _fs(self, pct):
         """Font size en % de la hauteur du dialogue."""