input_page.dart

import 'package:flutter/material.dart';
import 'widget_utils.dart' show screenAwareSize;

class InputPage extends StatelessWidget {
  Widget build(BuildContext context) {
    return Scaffold(
      body: Padding(
        padding: MediaQuery.of(context).padding,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            _buildTitle(context),
            Expanded(child: _buildCards(context)),
            _buildBottom(context),
          ],
        ),
      ),
    );
  }
  ...
}