Answers for "align column center flutter"

flutter column center horizontal text

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

flutter column widget vertical center

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