diff --git a/packages/io_crossword_ui/lib/src/theme/io_crossword_theme.dart b/packages/io_crossword_ui/lib/src/theme/io_crossword_theme.dart
index 77f0f575d..6ea3b1464 100644
--- a/packages/io_crossword_ui/lib/src/theme/io_crossword_theme.dart
+++ b/packages/io_crossword_ui/lib/src/theme/io_crossword_theme.dart
@@ -27,6 +27,8 @@ class IoCrosswordTheme {
     return ThemeData(
       useMaterial3: true,
       colorScheme: colorScheme,
+      scaffoldBackgroundColor: colorScheme.surface,
+      dialogBackgroundColor: colorScheme.surface,
       textTheme: _textTheme.textTheme,
       tabBarTheme: _tabBarTheme,
       cardColor: _cardTheme.plain.color,