remove obsolete sized box

@@ -23,10 +23,7 @@ class MyHome extends StatelessWidget {
   Widget build(BuildContext context) {
   Widget build(BuildContext context) {
     return Scaffold(
     return Scaffold(
       appBar: AppBar(title: const Text('Mobile Scanner Example')),
       appBar: AppBar(title: const Text('Mobile Scanner Example')),
-      body: SizedBox(
-        width: MediaQuery.of(context).size.width,
-        height: MediaQuery.of(context).size.height,
-        child: Column(
+      body: Column(
         mainAxisAlignment: MainAxisAlignment.center,
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
         children: [
           ElevatedButton(
           ElevatedButton(
@@ -67,8 +64,7 @@ class MyHome extends StatelessWidget {
                 ),
                 ),
               );
               );
             },
             },
-              child:
-                  const Text('MobileScanner with Controller (returning image)'),
+            child: const Text('MobileScanner with Controller (returning image)'),
           ),
           ),
           ElevatedButton(
           ElevatedButton(
             onPressed: () {
             onPressed: () {
@@ -102,7 +98,6 @@ class MyHome extends StatelessWidget {
           ),
           ),
         ],
         ],
       ),
       ),
-      ),
     );
     );
   }
   }
 }
 }