diff --git a/scripts/ui/flashcards_study.gd b/scripts/ui/flashcards_study.gd
index 1bb575d..0fc74dc 100644
--- a/scripts/ui/flashcards_study.gd
+++ b/scripts/ui/flashcards_study.gd
@@ -180,7 +180,8 @@ func _build() -> void:
 	undo_button.visible = false
 	undo_button.pressed.connect(_undo)
 	root.add_child(undo_button)
-	_style_ghost_button(undo_button, UIThemeService.is_dark_mode())
+
+	refresh_theme_controls()
 
 
 func _caption_label(text: String) -> Label: