Answers for "container border shape flutter"

flutter container border

Container(
  decoration: BoxDecoration(
    border: Border.all(
      color: Colors.red,  // red as border color
    ),
  ),
  child: Text("Your text...")
)

flutter roudnd border container

Container(
   decoration: BoxDecoration(
    
   borderRadius: BorderRadius.all(Radius.circular(20))
 ),
 child: ...
)