How to add rounded solid shadow with border to card in flutter?

I have been trying to add a box shadow with solid color and border to a card which is inside a container but so far i am not able to get the desired result.

Desired Result

What i am able to do till now

I tried adding box shadow with offset but i am not getting the desired result.
So below is my implementation of the container

Container(
                        width: 120,
                        height: 40,
                        decoration:  BoxDecoration(
                          boxShadow: [

                            BoxShadow(

                              color: Colors.black.withOpacity(0.5),
                              blurRadius: 4.0,
                                offset: Offset(3.5, 3.5,),
                              blurStyle: BlurStyle.normal
                            ),
                          ],
                        ),
                        child: const Card(
                          child: Center(
                            child: Text("1-6 Months"),
                          ),
                        ),
                      ),

Any idea of how to do it or better yet the code itself would be much appreciated.

>Solution :

I think you should use a Stack widget and two Card widgets in the children field to get this result.