I want to customize `DateRangePicker` in flutter, How can I change the following elements?

1. Change the `Save` button to image.
2. Remove the `Switch to input` button.
3. Change the `header background` color.
4. Change `day name` color.
5. Change `background` color.
6. Change `selected item indicator` color.
7. Change `selected item text` color.
8. Change `selected range indicator` color.
9. Change `selected range text` color.

```dart
showDateRangePicker(
  context: context,
  firstDate: DateTime.now(),
  lastDate: DateTime.now().add(Duration(days: 100)),
  builder: (BuildContext context, Widget child) {
    return Theme(
      data: ThemeData(
        ...
      ),
      child: child,
    );
  },
);

```

[![enter image description here](https://i.stack.imgur.com/o9cue.png)](https://i.stack.imgur.com/o9cue.png)