Updated example.

example/lib/main.dart

@@ -148,7 +148,7 @@ class _QRViewExampleState extends State<QRViewExample> {
 
   Widget _buildQrView(BuildContext context) {
     // For this example we check how width or tall the device is and change the scanArea and overlay accordingly.
-    var scanArea = (MediaQuery.of(context).size.width < 500 ||
+    var scanArea = (MediaQuery.of(context).size.width < 400 ||
             MediaQuery.of(context).size.height < 400)
         ? 150.0
         : 300.0;