content:   import 'package:flutter/material.dart';
    final ThemeData myTheme = ThemeData(
      primarySwatch: Colors.blue,
      brightness: Brightness.light,
      primaryColor: Color( 0xff2196f3 ),
      primaryColorBrightness: Brightness.dark,
      primaryColorLight: Color( 0xffbbdefb ),
      primaryColorDark: Color( 0xff1976d2 ),
      accentColor: Color( 0xff2196f3 ),
      accentColorBrightness: Brightness.dark,
      canvasColor: Color( 0xfffafafa ),
      scaffoldBackgroundColor: Color( 0xfffafafa ),
      bottomAppBarColor: Color( 0xffffffff ),
      cardColor: Color( 0xffffffff ),
      dividerColor: Color( 0x1f000000 ),
      highlightColor: Color( 0x66bcbcbc ),
      splashColor: Color( 0x66c8c8c8 ),
      selectedRowColor: Color( 0xfff5f5f5 ),
      unselectedWidgetColor: Color( 0x8a000000 ),
      disabledColor: Color( 0x61000000 ),
      buttonColor: Color( 0xffe0e0e0 ),
      toggleableActiveColor: Color( 0xff1e88e5 ),
      secondaryHeaderColor: Color( 0xffe3f2fd ),
      textSelectionColor: Color( 0xff90caf9 ),
      cursorColor: Color( 0xff4285f4 ),
      textSelectionHandleColor: Color( 0xff64b5f6 ),
      backgroundColor: Color( 0xff90caf9 ),
      dialogBackgroundColor: Color( 0xffffffff ),
      indicatorColor: Color( 0xff2196f3 ),
      hintColor: Color( 0x8a000000 ),
      errorColor: Color( 0xffd32f2f ),
      buttonTheme: ButtonThemeData(
        textTheme: ButtonTextTheme.normal,
        minWidth: 88,
        height: 36,
        padding: EdgeInsets.only(top:0,bottom:0,left:16, right:16),
        shape:     RoundedRectangleBorder(
        side: BorderSide(color: Color(0xff000000), width: 0, style: BorderStyle.none, ),
        borderRadius: BorderRadius.all(Radius.circular(2.0)),
      )
   ,
        alignedDropdown: false ,
        buttonColor: Color( 0xffe0e0e0 ),
        disabledColor: Color( 0x61000000 ),
        highlightColor: Color( 0x29000000 ),
        splashColor: Color( 0x1f000000 ),
        colorScheme: ColorScheme(
          primary: Color( 0xff2196f3 ),
          primaryVariant: Color( 0xff1976d2 ),
          secondary: Color( 0xff2196f3 ),
          secondaryVariant: Color( 0xff1976d2 ),
          surface: Color( 0xffffffff ),
          background: Color( 0xff90caf9 ),
          error: Color( 0xffd32f2f ),
          onPrimary: Color( 0xffffffff ),
          onSecondary: Color( 0xffffffff ),
          onSurface: Color( 0xff000000 ),
          onBackground: Color( 0xffffffff ),
          onError: Color( 0xffffffff ),
          brightness: Brightness.light,
        ),
      ),
      textTheme: TextTheme(
        display4: TextStyle(
        color: Color( 0x8a000000 ),
        fontSize: 96,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display3: TextStyle(
        color: Color( 0x8a000000 ),
        fontSize: 60,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display2: TextStyle(
        color: Color( 0x8a000000 ),
        fontSize: 48,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        display1: TextStyle(
        color: Color( 0x8a000000 ),
        fontSize: 34,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        headline: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 24,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        title: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 20,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subhead: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body2: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body1: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        caption: TextStyle(
        color: Color( 0x8a000000 ),
        fontSize: 12,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        button: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subtitle: TextStyle(
        color: Color( 0xff000000 ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        overline: TextStyle(
        color: Color( 0xff000000 ),
        fontSize: 10,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      ),
      primaryTextTheme: TextTheme(
        display4: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 96,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display3: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 60,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display2: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 48,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        display1: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 34,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        headline: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 24,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        title: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 20,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subhead: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body2: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body1: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        caption: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 12,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        button: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subtitle: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        overline: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 10,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      ),
      accentTextTheme: TextTheme(
        display4: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 96,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display3: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 60,
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ),
        display2: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 48,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        display1: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 34,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        headline: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 24,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        title: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 20,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subhead: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body2: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        body1: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        caption: TextStyle(
        color: Color( 0xb3ffffff ),
        fontSize: 12,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        button: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        subtitle: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ),
        overline: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 10,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      ),
      inputDecorationTheme:   InputDecorationTheme(
      labelStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      helperStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      hintStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      errorStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      errorMaxLines: null,
      hasFloatingPlaceholder: true,
      isDense: false,
      contentPadding: EdgeInsets.only(top:12,bottom:12,left:0, right:0),
      isCollapsed : false,
      prefixStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      suffixStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      counterStyle: TextStyle(
        color: Color( 0xdd000000 ),
        fontSize: 16,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      filled: false,
      fillColor: Color( 0x00000000 ),
      errorBorder: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
      focusedBorder: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
      focusedErrorBorder: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
      disabledBorder: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
      enabledBorder: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
      border: UnderlineInputBorder(
        borderSide: BorderSide(color: Color(0xff000000), width: 1, style: BorderStyle.solid, ),
        borderRadius: BorderRadius.all(Radius.circular(4.0)),
      ),
    ),
      iconTheme: IconThemeData(
        color: Color( 0xdd000000 ),
        opacity: 1,
        size: 24,
      ),
      primaryIconTheme: IconThemeData(
        color: Color( 0xffffffff ),
        opacity: 1,
        size: 24,
      ),
      accentIconTheme: IconThemeData(
        color: Color( 0xffffffff ),
        opacity: 1,
        size: 24,
      ),
      sliderTheme: SliderThemeData(
        activeTrackColor: null,
        inactiveTrackColor: null,
        disabledActiveTrackColor: null,
        disabledInactiveTrackColor: null,
        activeTickMarkColor: null,
        inactiveTickMarkColor: null,
        disabledActiveTickMarkColor: null,
        disabledInactiveTickMarkColor: null,
        thumbColor: null,
        disabledThumbColor: null,
        thumbShape: null(),
        overlayColor: null,
        valueIndicatorColor: null,
        valueIndicatorShape: null(),
        showValueIndicator: null,
        valueIndicatorTextStyle: TextStyle(
        color: Color( 0xffffffff ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
      ),
      tabBarTheme: TabBarTheme(
        indicatorSize: TabBarIndicatorSize.tab,
        labelColor: Color( 0xffffffff ),
        unselectedLabelColor: Color( 0xb2ffffff ),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: Color( 0x1f000000 ),
        brightness: Brightness.light,
        deleteIconColor: Color( 0xde000000 ),
        disabledColor: Color( 0x0c000000 ),
        labelPadding: EdgeInsets.only(top:0,bottom:0,left:8, right:8),
        labelStyle: TextStyle(
        color: Color( 0xde000000 ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        padding: EdgeInsets.only(top:4,bottom:4,left:4, right:4),
        secondaryLabelStyle: TextStyle(
        color: Color( 0x3d000000 ),
        fontSize: 14,
        fontWeight: FontWeight.w400,
        fontStyle: FontStyle.normal,
      ),
        secondarySelectedColor: Color( 0x3d2196f3 ),
        selectedColor: Color( 0x3d000000 ),
        shape: StadiumBorder( side: BorderSide(color: Color(0xff000000), width: 0, style: BorderStyle.none, ) ),
      ),
      dialogTheme: DialogTheme(
        shape:     RoundedRectangleBorder(
        side: BorderSide(color: Color(0xff000000), width: 0, style: BorderStyle.none, ),
        borderRadius: BorderRadius.all(Radius.circular(0.0)),
      )
  
      ),
    );
  