input_page.dart

class InputPage extends StatelessWidget {
  ...
  Widget _buildTitle(BuildContext context) {
    return Padding(
      padding: EdgeInsets.only(
        left: 24.0,
        top: screenAwareSize(56.0, context),
      ),
      child: Text(
        "BMI Calculator",
        style: new TextStyle(fontSize: 28.0, fontWeight: FontWeight.bold),
      ),
    );
  }
  ...
}