check the note I had mentionedin below code
Padding( padding: EdgeInsets.symmetric(vertical: 5), child: Container( // color: Colors.purple, // margin: const EdgeInsets.only(top: 45, bottom: 15), padding: const EdgeInsets.only(left: 20, right: 20), child: Row( children: [ Expanded( child: Column( //Note : Add this crossAxisAlignment: CrossAxisAlignment.start, children: [ Text("Bengaluru"), Text("R.T Nagar") ]), ), customContainer(iconData: Icons.search,), SizedBox(width: 10,), customContainer(iconData: Icons.notifications,), ])), ),

If anybody is looking for complete circular button then I achieved it this way:
Center( child: SizedBox.fromSize( size: Size(80, 80), // Button width and height child: ClipOval( child: Material( color: Colors.pink[300], // Button color child: InkWell( splashColor: Colors.yellow, // splash color onTap: () {}, // Button pressed child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Icon(Icons.linked_camera), // Icon Text("Picture"), // Text ], ), ), ), ), ), )