DART

flutter column center horizontal text

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

center column in container flutter

Column(
 mainAxisAlignment: MainAxisAlignment.center,
 crossAxisAlignment: CrossAxisAlignment.center,
 children:[
    ...
 ]
 )