Flutter Container widget center aligns its child widget within itself, along vertical and horizontal axes.

Syntax

                  Container(
                    child: someWidget,
                  )
                  

Properties

                  Container({Key key,  
                      AlignmentGeometry alignment,   
                      EdgeInsetsGeometry padding,   
                      Color color,   
                      double width,   
                      double height,  
                      Decoration decoration,   
                      Decoration foregroundDecoration,   
                      BoxConstraints constraints,   
                      Widget child,   
                      Clip clipBehavior: Clip.none  
            }); 

            

Examples

                  import 'package:flutter/material.dart';
    
               
                void main() {
                
                 
                  runApp(
                  
                    
                    Container(
                      color: Colors.green, // <-- change this
                    ),
                    
                  );
                }

  

                

                import 'package:flutter/material.dart';
 
void main() => runApp(const MyApp());
 
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
 
  static const String _title = 'Flutter Tutorial';
 
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}
 
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);
 
  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
 
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        children: <Widget>[
          const SizedBox(height: 10,),
          Container(
            height: 150,
            width: 200,
            color: Colors.green,
            alignment: Alignment.center,
            child: const Text('Container'),
          ),
        ],
      ),
    );
  }
}
                

Container()