Answers for "flutter round border"

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: ...
)

round border button flutter

RawMaterialButton(
  onPressed: () {},
  elevation: 2.0,
  fillColor: Colors.white,
  child: Icon(
    Icons.pause,
    size: 35.0,
  ),
  padding: EdgeInsets.all(15.0),
  shape: CircleBorder(),
)