diff --git a/lib/screens/marker.dart b/lib/screens/marker.dart
index ca95bfa..2e7d81d 100644
--- a/lib/screens/marker.dart
+++ b/lib/screens/marker.dart
@@ -53,7 +53,7 @@ class MarkerScreen extends StatelessWidget {
                 },
                 child: const Text('Code eingeben'),
               ),
-              Container(
+              SizedBox(
                 height: 400,
                 child: MobileScanner(
                   fit: BoxFit.contain,