Flutter – Expand component to page limit without scroll

I have this screen, but the white part I would like to expand it to the bottom limit of the user’s screen, but I am not getting it, it has a part in blue as shown in the image.

Page that is in error

Remembering that I would like to make this page responsive regardless of the user’s screen size, it has to go to the end

This is my code:

Scaffold(
      backgroundColor: Colors.blue,
      body: CustomScrollView(
        slivers: [
          SliverFillRemaining(
            hasScrollBody: false,
            child: Column(
              children: [
                Column(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Padding(
                      padding: EdgeInsets.only(top: 26.h, bottom: 160.h),
                      child: Container(),
                    ),
                    Container(
                      padding: EdgeInsets.symmetric(horizontal: 24.w),
                      alignment: Alignment.topCenter,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(8.r),
                          topRight: Radius.circular(8.r),
                        ),
                        color: Colors.white,
                      ),
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          SizedBox(height: 32.h),
                          Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text('Thanks for returning',
                                  style: TextStyle(
                                    fontSize: 16.sp,
                                    color: Colors.blueGrey,
                                    fontWeight: FontWeight.w900,
                                  )),
                              SizedBox(
                                height: 8.h,
                              ),
                              Text(
                                'Enter your password to login into your account: ',
                                softWrap: true,
                                style: TextStyle(
                                  fontSize: 22.sp,
                                  color: Colors.black,
                                  fontWeight: FontWeight.w400,
                                ),
                              ),
                            ],
                          ),
                          SizedBox(height: 24.h),
                          Form(
                            key: _userCredentialsForm,
                            autovalidateMode:
                                AutovalidateMode.onUserInteraction,
                            child: Column(
                              children: [
                                PSInputText(
                                  controller: _passwordController,
                                  inputColor: Colors.blue,
                                  title: 'Password',
                                  hintText: AuthStrings.password,
                                  keyboardType: TextInputType.number,
                                  maxLength: 6,
                                  isObscureText: true,
                                  textInputAction: TextInputAction.done,
                                  inputFormatters: [
                                    FilteringTextInputFormatter.digitsOnly,
                                  ],
                                  onChanged: (value) {},
                                ),
                              ],
                            ),
                          ),
                          Column(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Padding(
                                padding: EdgeInsets.only(top: 10.h),
                                child: PSPrimaryTextButton(
                                  fontSize: 14,
                                  text: 'Forgot password',
                                  onPressed: () => controller.add(
                                    ForgotPasswordEvent(),
                                  ),
                                ),
                              ),
                              SizedBox(height: 40.h),
                              SizedBox(
                                height: 40.h,
                                child: PSLoginButton(
                                  text: 'Log in',
                                  onPressed: () {},
                                ),
                              ),
                            ],
                          ),
                          Padding(
                            padding: EdgeInsets.only(bottom: 8.h, top: 32.h),
                            child: FutureBuilder(
                              initialData: '-',
                              future: AppConfig.appVersion,
                              builder: (ctx, appVersion) =>
                                  Text('App Version ${appVersion.data}',
                                      style: TextStyles.fontSize12(
                                        color: Colors.black,
                                      )),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ],
      ),
    );

I already tried to use the expand inside column, i also tried to use positioned.fill.

But they all give layout errors, the only solution was to place a sized box to lower the container to the end with its children, but this is not the behavior I would like, since it has a scroll for the user!