DART

flutter container

Container(
            alignment: Alignment.center,
            child: Text('Container'),
            width: 200.0,
            height: 200.0,
            decoration: BoxDecoration(
              color: Colors.purple[200],
              borderRadius: BorderRadius.circular(60.0)              
            )
          ),

flutter container

Center(
  child: Container(
    margin: const EdgeInsets.all(10.0),
    color: Colors.amber[600],
    width: 48.0,
    height: 48.0,
  ),
)

flutter container

Center(
  child: Container(
    margin: const EdgeInsets.all(10.0),
    color: Colors.amber[600],
    width: 48.0,
    height: 48.0,
  ),
)