scan button and padding bottom scan button

lib/screen/saya/profile_screen.dart

@@ -54,6 +54,9 @@ class _ProfileScreenState extends State<ProfileScreen> {
 
   @override
   Widget build(BuildContext context) {
+    final screenWidth = MediaQuery.of(context).size.width;
+    final buttonScanSize = screenWidth * 0.20;
+    final double bottomPadding = (9000 / screenWidth).clamp(0, 0.2);
     return Scaffold(
       backgroundColor: const Color.fromARGB(255, 255, 255, 255),
       body: Stack(
@@ -341,8 +344,8 @@ class _ProfileScreenState extends State<ProfileScreen> {
           ),
           Positioned(bottom: 0, left: 0, right: 0, child: MainMenu()),
           Positioned(
-            bottom: 8,
-            left: MediaQuery.of(context).size.width / 2 - 38,
+            bottom: bottomPadding * 32,
+            left: (screenWidth - buttonScanSize) / 2,
             child: Transform.translate(
               offset: Offset(0, -20),
               child: ScanButton(),