Stack item are not positioned when the screen size changes Flutter - flutter

Question

1-I am making a simple app where I am creating Profile section Where there is Stack at the top with two widgets
but the problem is when ever I test the app on different screen sizes the Stack item widgets are not at same position even i tried with MediaQuery
2-And the Second issue is I want the Circle Avatar to be place Half inside the Container And Half Out-side the Container.
Here is my Profile.dart class
class SettingsScreen extends StatelessWidget {
const SettingsScreen({super.key});
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: Column(
children: <Widget>[
Stack(
children: <Widget>[
Container(
// height: mediaQueryData.size.height * 0.4,
height: 300,
width: double.infinity,
decoration: const BoxDecoration(
gradient: LinearGradient(colors: [
Colors.black,
Color.fromRGBO(255, 243, 18, 3),
], begin: Alignment.topLeft, end: Alignment.bottomRight),
borderRadius: BorderRadius.only(
bottomLeft: Radius.circular(50),
bottomRight: Radius.circular(50))),
),
const Padding(
padding: EdgeInsets.only(top: 240, left: 140),
child: CircleAvatar(
backgroundColor: Color.fromARGB(183, 40, 46, 3),
radius: 50,
child: Text(
"M-E",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 32),
),
),
),
Positioned(
top: 110,
left: 40,
child: Text(
"مثابة ايلاف",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 70),
),
),
//),
],
),
Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 0),
child: ListTile(
trailing: const Icon(
Icons.cast_for_education,
color: Colors.black,
),
title: const Text(
"Subjects (مضامین)",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 18),
),
onTap: () {},
),
),
const Divider(
color: Colors.black,
thickness: 0.5,
),
Padding(
padding: const EdgeInsets.only(top: 2),
child: ListTile(
trailing: const Icon(
Icons.contacts,
color: Colors.black,
),
title: const Text(
"Contact (رابطہ )",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 18),
),
onTap: () {},
),
),
const Divider(
color: Colors.black,
thickness: 0.5,
),
Padding(
padding: const EdgeInsets.only(top: 2),
child: ListTile(
trailing: const Icon(
Icons.settings,
color: Colors.black,
),
title: const Text(
"Setting (ترتیبات)",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 18),
),
onTap: () {},
),
),
const Divider(
color: Colors.black,
thickness: 0.5,
),
Padding(
padding: const EdgeInsets.only(top: 2),
child: ListTile(
trailing: const Icon(
Icons.logout,
color: Colors.black,
),
title: const Text(
"Logout (لاگ آوٹ)",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 18),
),
onTap: () {},
),
),
],
),
],
),
));
}
}
Here is the const result I want when the app run on different devices
Here is the result I don't want to be happens whenever the device size changes

Answer 1

Use this structure.
Positioned(
top: 110,
left: 1,
right:1
child: Text(
"مثابة ايلاف",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 70),
),
),