upd theme

don't use material3

lib/themes.dart

@@ -1,68 +1,56 @@
-// ignore_for_file: deprecated_member_use
-
 import 'package:flutter/material.dart';
 
 // This file is adapted from
 // https://github.com/flutter/flutter/blob/master/examples/flutter_gallery/lib/gallery/themes.dart
 
 final kLightTheme = _buildLightTheme();
 final kDarkTheme = _buildDarkTheme();
+const _primaryColor = Color(0xFF0175c2);
+const _secondaryColor = Color(0xFF13B9FD);
 
 ThemeData _buildLightTheme() {
-  const Color primaryColor = Color(0xFF0175c2);
-  const Color secondaryColor = Color(0xFF13B9FD);
-  final ColorScheme colorScheme = const ColorScheme.light().copyWith(
-    primary: primaryColor,
-    secondary: secondaryColor,
+  final colorScheme = const ColorScheme.light().copyWith(
+    primary: _primaryColor,
+    secondary: _secondaryColor,
+    background: Colors.white,
+    error: const Color(0xFFB00020),
   );
-  final ThemeData base = ThemeData(
+  return ThemeData(
+    useMaterial3: false,
     brightness: Brightness.light,
     colorScheme: colorScheme,
-    primaryColor: primaryColor,
+    primaryColor: _primaryColor,
     indicatorColor: Colors.white,
-    toggleableActiveColor: const Color(0xFF1E88E5),
     splashColor: Colors.white24,
     splashFactory: InkRipple.splashFactory,
     canvasColor: Colors.white,
     scaffoldBackgroundColor: Colors.white,
-    backgroundColor: Colors.white,
-    errorColor: const Color(0xFFB00020),
     buttonTheme: ButtonThemeData(
       colorScheme: colorScheme,
       textTheme: ButtonTextTheme.primary,
     ),
   );
-  return base.copyWith(
-    textTheme: base.textTheme,
-    primaryTextTheme: base.primaryTextTheme,
-  );
 }
 
 ThemeData _buildDarkTheme() {
-  const Color primaryColor = Color(0xFF0175c2);
-  const Color secondaryColor = Color(0xFF13B9FD);
-  final ColorScheme colorScheme = const ColorScheme.dark().copyWith(
-    primary: primaryColor,
-    secondary: secondaryColor,
+  final colorScheme = const ColorScheme.dark().copyWith(
+    primary: _primaryColor,
+    secondary: _secondaryColor,
+    background: const Color(0xFF202124),
+    error: const Color(0xFFB00020),
   );
-  final ThemeData base = ThemeData(
+  return ThemeData(
+    useMaterial3: false,
     brightness: Brightness.dark,
-    primaryColor: primaryColor,
+    primaryColor: _primaryColor,
     primaryColorDark: const Color(0xFF0050a0),
-    primaryColorLight: secondaryColor,
+    primaryColorLight: _secondaryColor,
     indicatorColor: Colors.white,
-    toggleableActiveColor: const Color(0xFF6997DF),
     canvasColor: const Color(0xFF202124),
     scaffoldBackgroundColor: const Color(0xFF202124),
-    backgroundColor: const Color(0xFF202124),
-    errorColor: const Color(0xFFB00020),
     buttonTheme: ButtonThemeData(
       colorScheme: colorScheme,
       textTheme: ButtonTextTheme.primary,
     ),
   );
-  return base.copyWith(
-    textTheme: base.textTheme,
-    primaryTextTheme: base.primaryTextTheme,
-  );
 }