flutter round shape border 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 squared avatar rounded borders

ClipRRect(
  borderRadius: BorderRadius.circular(20.0),//or 15.0
  child: Container(
    height: 70.0,
    width: 70.0,
    color: Color(0xffFF0E58),
    child: Icon(Icons.volume_up, color: Colors.white, size: 50.0),
  ),
),