how to give radius to container in flutter code example

Example 1: flutter container rounded corners

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

Example 2: container flutter border radius

Container(
	decoration: BoxDecoration(
    	color: Colors.blue,
    	borderRadius: BorderRadius.all(
    		Radius.circular(10)
    	)
    )
)

Example 3: flutter container border radius

Container(
  child: Text(
    'This is a Container',
    textScaleFactor: 2,
    style: TextStyle(color: Colors.black),
  ),
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(10),
    color: Colors.white,
    boxShadow: [
      BoxShadow(color: Colors.green, spreadRadius: 3),
    ],
  ),
  height: 50,
),

Example 4: flutter rounded container transperent corners

new Container(
          height: 300.0,
          color: Colors.transparent,
          child: new Container(
            decoration: new BoxDecoration(
              color: Colors.green,
              borderRadius: new BorderRadius.only(
                topLeft: const Radius.circular(40.0),
                topRight: const Radius.circular(40.0),
              )
            ),
            child: new Center(
            child: new Text("Hi modal sheet"),
           )
         ),
        ),

Example 5: container border radius flutter

Container(
      child: Text(
          'This is a Container',
          textScaleFactor: 2,
          style: TextStyle(color: Colors.black),
      ),

      decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(10),
          color: Colors.white,
          border: Border(
              left: BorderSide(
                  color: Colors.green,
                  width: 3,
              ),
            ),
          ),
      height: 50,
     ),

Example 6: flutter container rounded corners

new Center(    child: new Container(      width: 200.0,      height: 200.0,      color: Colors.white,      child: new Container(        decoration: new BoxDecoration(          border: new Border.all(              color: Colors.green,              width: 5.0,              style: BorderStyle.solid          ),          borderRadius: new BorderRadius.all(new Radius.circular(20.0)),          image: new DecorationImage(              image: new AssetImage('assets/images/JL-Logo-150.png'),          )        ),      ),    ),  );