Flutter 如何对齐卡片小部件中的图标按钮

我在将图标按钮与卡的中间对齐时遇到了问题.如图所示，图标按钮位于卡片顶部.

我怎么才能让它在卡的一半大小上满足呢？有什么建议吗？(我希望按钮位于卡片的中间)

try :我try 将填充或包装我的行小部件与中心，但它不起作用.

 child: new Container(
            height: 150.0,
            width: MediaQuery.of(context).size.width,
            child: new Card(
              color: Colors.white,
              elevation: 8.0,
              child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    Column(
                      children: [
                        IconButton(
                            onPressed: () {},
                            icon: Icon(Icons.sticky_note_2),
                            iconSize: 35,
                            color: Colors.lightBlue),
                        Text(
                          "Notes",
                          style: TextStyle(
                            color: Colors.black,
                            fontSize: 15,
                          ),
                        ),
                      ],
                    ),
                    Column(
                      children: [
                        IconButton(
                          onPressed: () {
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                  builder: (context) => QuizRoute()),
                            );
                          },
                          icon: Icon(Icons.quiz),
                          iconSize: 35,
                        ),
                          Text(
                          "Quizzes",
                          style: TextStyle(
                            color: Colors.black,
                            fontSize: 15,
                          ),
                        ),
                      ],
                    ),
                    Column(
                      children: [
                        IconButton(
                          onPressed: () {
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                  builder: (context) => EbooksRoute()),
                            );
                          },
                          icon: Icon(Icons.auto_stories),
                          iconSize: 35,
                        ),
                          Text(
                          "Ebooks",
                          style: TextStyle(
                            color: Colors.black,
                            fontSize: 15,
                          ),
                        ),
                      ],
                    ),
                  ]),
            ),
          ),
        ),
      ],
    ),