diff --git a/app/lib/activation_code/src/widgets/enter_activation_code_text_field.dart b/app/lib/activation_code/src/widgets/enter_activation_code_text_field.dart
index 819fcab16..d7cab4ae1 100644
--- a/app/lib/activation_code/src/widgets/enter_activation_code_text_field.dart
+++ b/app/lib/activation_code/src/widgets/enter_activation_code_text_field.dart
@@ -31,8 +31,10 @@ class EnterActivationCodeTextField extends StatelessWidget
             child: Theme(
               data: Theme.of(context).copyWith(
                 primaryColor: Colors.white,
-                colorScheme:
-                    ColorScheme.fromSwatch().copyWith(secondary: Colors.white),
+                colorScheme: Theme.of(context).isDarkTheme
+                    ? null
+                    : ColorScheme.fromSwatch()
+                        .copyWith(secondary: Colors.white),
               ),
               child: TextField(
                 maxLines: 1,
@@ -44,6 +46,14 @@ class EnterActivationCodeTextField extends StatelessWidget
                 onEditingComplete: () => onSend(context, bloc),
                 decoration: InputDecoration(
                   border: const OutlineInputBorder(),
+                  focusedBorder: Theme.of(context)
+                      .inputDecorationTheme
+                      .focusedBorder
+                      ?.copyWith(
+                        borderSide: const BorderSide(
+                          color: Colors.white,
+                        ),
+                      ),
                   labelText: 'Aktivierungscode',
                   hintText: "z.B. NavigationV2",
                   labelStyle: const TextStyle(color: Colors.white),