product_detail_page.dart

return Scaffold(
  body: Stack(
    children: <Widget>[
      ProductDetailBackground(
        screenHeight: screenHeight,
        screenWidth: screenWidth,
      ),
      SingleChildScrollView(
        child: Column(
          children: <Widget>[
            ProductDetailTopBar(),
            ProductContentWidget(product: product, screenHeight: screenHeight),
          ],
        ),
      ),
    ],
  ),
);