Improve material theme

app/lib/core/theme.dart

@@ -128,7 +128,9 @@ class TraleTheme {
 
   /// get elevated shade of clr
   Color colorOfElevation(double elevation, Color clr) => Color.alphaBlend(
-    getFontColor(clr).withOpacity(overlayOpacity(elevation)), clr,
+    getFontColor(clr).withValues(
+        alpha: overlayOpacity(elevation)
+    ), clr,
   );
   /// 24 elevation shade of bg
   Color get bgShade1 => bgElevated(24);
@@ -196,6 +198,10 @@ class TraleTheme {
       year2023: false,
     );
 
+    const CardThemeData cardTheme = CardThemeData(
+      shadowColor: Colors.transparent,
+    );
+
     const ProgressIndicatorThemeData progressIndicatorTheme =
       ProgressIndicatorThemeData(year2023: false);
 
@@ -207,6 +213,7 @@ class TraleTheme {
     ).copyWith(
       listTileTheme: listTileThemeData,
       sliderTheme: sliderTheme,
+      cardTheme: cardTheme,
       progressIndicatorTheme: progressIndicatorTheme,
       pageTransitionsTheme: const PageTransitionsTheme(
         builders: <TargetPlatform, PageTransitionsBuilder>{

app/lib/pages/about.dart

@@ -366,17 +366,12 @@ class _About extends State<About> {
       );
     }
 
-    return Container(
-      color: Theme.of(context).colorScheme.surface,
-      child: SafeArea(
-        child: Scaffold(
-            body:  NestedScrollView(
-              headerSliverBuilder: (BuildContext context, bool _) {
-                return <Widget>[appBar()];
-              },
-              body: aboutList(),
-            ),
-        ),
+    return Scaffold(
+      body: NestedScrollView(
+        headerSliverBuilder: (BuildContext context, bool _) {
+          return <Widget>[appBar()];
+        },
+        body: aboutList(),
       ),
     );
   }

app/lib/pages/faq.dart

@@ -188,17 +188,12 @@ class _FAQ extends State<FAQ> {
       );
     }
 
-    return Container(
-      color: Theme.of(context).colorScheme.surface,
-      child: SafeArea(
-        child: Scaffold(
-            body:  NestedScrollView(
-              headerSliverBuilder: (BuildContext context, bool _) {
-                return <Widget>[appBar()];
-              },
-              body: faqList(),
-            ),
-        ),
+    return Scaffold(
+      body:  NestedScrollView(
+        headerSliverBuilder: (BuildContext context, bool _) {
+          return <Widget>[appBar()];
+        },
+        body: faqList(),
       ),
     );
   }

app/lib/pages/measurementScreen.dart

@@ -52,11 +52,10 @@ class _MeasurementScreen extends State<MeasurementScreen> {
     }
 
     return StreamBuilder<List<Measurement>>(
-        stream: database.streamController.stream,
-        builder: (
-            BuildContext context, AsyncSnapshot<List<Measurement>> snapshot,
-            ) => measurementScreenWrapper(context, snapshot)
+      stream: database.streamController.stream,
+      builder: (
+        BuildContext context, AsyncSnapshot<List<Measurement>> snapshot,
+      ) => measurementScreenWrapper(context, snapshot),
     );
-
   }
 }

app/lib/pages/onBoarding.dart

@@ -91,7 +91,7 @@ class _OnBoardingPageState extends State<OnBoardingPage> {
         image: SizedBox(
           width: MediaQuery.of(context).size.width,
           height: 0.5 * MediaQuery.of(context).size.width,
-          child: const ThemeSelection(),
+          child: ThemeSelection(controller: CarouselController()),
         ),
         decoration: pageDecoration.copyWith(
           imagePadding: EdgeInsets.symmetric(

app/lib/pages/overview.dart

@@ -121,10 +121,10 @@ class _OverviewScreen extends State<OverviewScreen> {
       stream: database.streamController.stream,
       builder: (
           BuildContext context, AsyncSnapshot<List<Measurement>> snapshot,
-          ) => SafeArea(
+      ) => SafeArea(
         key: key,
-        child: overviewScreenWrapper(context, snapshot)
-        )
+        child: overviewScreenWrapper(context, snapshot),
+      )
     );
   }
 }