Answers for "how to center hint text in flutter"

flutter column center horizontal text

Center(
          child: Column(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text('You are at center!'),
            ],
          ),
        ),

flutter center text in container

child: Center(
        child: Text(
          "Hello World",
          textAlign: TextAlign.center,
        ),
      ),