onboarding_page.dart

        child: SafeArea(
          child: Container(
            height: MediaQuery.of(context).size.height,
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 10.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  SizedBox(height: 20),
                  Container(
                    height: 560.0,
                    child: PageView(
                      physics: ClampingScrollPhysics(),
                      controller: _pageController,
                      onPageChanged: (int page) => setState(() => _currentPage = page),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),