No center！

[ruidoc]

[studiozocaro]

same problem

[mateotomas2]

It's working perfectly for me. Can you try this code snippet?

import 'package:flutter/material.dart';
import 'package:line_awesome_icons/line_awesome_icons.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
                color: Colors.red,
                child: Icon(LineAwesomeIcons.angle_left,
                    color: Colors.black, size: 16)),
            Text(""),
            Container(
                width: 30,
                height: 30,
                color: Colors.red,
                child: Icon(LineAwesomeIcons.angle_left,
                    color: Colors.black, size: 16)),
            Text(""),
            Container(
                width: 130,
                height: 130,
                color: Colors.red,
                child: Icon(LineAwesomeIcons.angle_left,
                    color: Colors.black, size: 116)),
          ],
        ),
      ),
    );
  }
}