Text placed is center with using center widget – Flutter

Question: No center widget is used, still the title "Daily" is the center. How?

The code provided below is the of the UI of the app as shows in the image.
CarouselSlider is used to slide horizontally.

Code:

CarouselSlider(
                items: [
                Column(
                children: [
                Container(
                child: Text("Daily", style: TextStyle(color: Colors.white, fontSize: 20)),
                ),
                Expanded(
                   child: SingleChildScrollView(
                   child: Container(
                   margin: const EdgeInsets.fromLTRB(10, 10, 10, 10),
                   child: Text(data['daily'], textAlign: TextAlign.justify, style: TextStyle(color: Colors.white, fontSize: 17 )),
                                                  )),
                                              ),
                                            ],
                                          ),
                                          Column(
                                            children: [
                                              Container(
                                                child: Text("Weekly", style: TextStyle(color: Colors.white, fontSize: 20)),
                                              ),
                                              Expanded(
                                                child: SingleChildScrollView(
                                                  child: Container(
                                                    margin: const EdgeInsets.fromLTRB(10, 10, 10, 10),
                                                    child: Text(data['weekly'], textAlign: TextAlign.justify, style: TextStyle(color: Colors.white, fontSize: 17 )),
                                                  )),
                                              ),
                                            ],
                                          ),
                                        ],
                                    
                                    options: CarouselOptions(
                                      
                                      height: MediaQuery.of(context).size.height-300,                                      
                                      enlargeCenterPage: true,
                                      initialPage: 0,
                                      aspectRatio: 16/9,
                                      autoPlayCurve: Curves.fastOutSlowIn,
                                      enableInfiniteScroll: false,
                                      autoPlayAnimationDuration: Duration(milliseconds: 800),
                                      viewportFraction: 1,
                                    ),
                                  );