Can I Make A Container On One Another Small Container at main container border?

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I Want to make this type of UI and it's possible without using Stack?

Answer 1

 SizedBox(
              width: MediaQuery.of(context).size.width,
              height: MediaQuery.of(context).size.height / 4,
              child: Padding(
                padding: EdgeInsets.symmetric(horizontal: 8, vertical: 5),
                child: Stack(alignment: Alignment.bottomCenter, children: [
                  Container(
                    margin: EdgeInsets.only(bottom: 5),
                    decoration: BoxDecoration(
                        color: Colors.blueGrey,
                        borderRadius: BorderRadius.circular(20)),
                  ),
                  Container(
                    height: 15,
                    width: MediaQuery.of(context).size.width / 4,
                    decoration: BoxDecoration(
                        color: Colors.black,
                        borderRadius: BorderRadius.circular(20)),
                  )
                ]),
              ),
            )

your problem is fixed now , use this code