flutter style diabled button

ElevatedButton(
      onPressed: null,
      child: Text('Submit disable'),
      style: ButtonStyle(
        onSurface: Colors.white,
      ),
    ),

ElevatedButton(
      onPressed: null,
      child: Text('Submit disable'),
      style: ButtonStyle(
        backgroundColor: MaterialStateProperty.resolveWith<Color>(
          (Set<MaterialState> states) {
            if (states.contains(MaterialState.pressed))
              return Theme.of(context)
                  .colorScheme
                  .primary
                  .withOpacity(0.5);
            else if (states.contains(MaterialState.disabled))
              return Colors.green;
            return null; // Use the component's default.
          },
        ),
      ),
    ),