boxdecoration radius flutter code example

Example 1: column round border flutter

Container(
  decoration: BoxDecoration(
    border: Border.all(
      color: Colors.red[500],
    ),
    color: Colors.green[500],
    borderRadius: BorderRadius.all(Radius.circular(20))
  ),
  child: ...
)

Example 2: flutter round container

QUESTION: Flutter give container rounded border

ANSWER1: 

Container(
    decoration: BoxDecoration(
    shape: BoxShape.circle,
    ),
    child:   ...
    ),

ANSWER 2:
Container(
  decoration: BoxDecoration(
    border: Border.all(
      color: Colors.red[500],
    ),
    borderRadius: BorderRadius.all(Radius.circular(20))
  ),
  child: ...
)

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Dart Example