diff --git a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java
index 6c1d319..1655b24 100644
--- a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java
+++ b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/GameActivity.java
@@ -95,7 +95,7 @@ public class GameActivity extends BaseActivity implements NavigationView.OnNavig
     TextView viewName ;
     RatingBar ratingBar;
     SaveLoadStatistics statistics = new SaveLoadStatistics(this);
-    WinDialog dialog = null;
+    WinDialog dialog;
     private boolean gameSolved = false;
     private boolean startGame = true;
 
diff --git a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/WinDialog.java b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/WinDialog.java
index a94e085..da09e34 100644
--- a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/WinDialog.java
+++ b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/view/WinDialog.java
@@ -53,7 +53,6 @@ public void setParam(String timeString, String hintString, boolean isNewBestTime
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-
         super.onCreate(savedInstanceState);
 
         ((TextView)findViewById(R.id.win_hints)).setText(hintString);
diff --git a/app/src/main/res/drawable-night-v21/ic_trophy_black_48dp.xml b/app/src/main/res/drawable-night-v21/ic_trophy_black_48dp.xml
deleted file mode 100644
index 844b657..0000000
--- a/app/src/main/res/drawable-night-v21/ic_trophy_black_48dp.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="192dp"
-    android:height="192dp"
-    android:viewportWidth="192"
-    android:viewportHeight="192">
-    <path
-        android:fillColor="?attr/standardVectorGraphic"
-        android:name="Shape 1"
-        android:pathData="m48 32v56h-16v-56zm112 0v56h-16v-56zm-144 -16c0 0 0 1.52 0 4.13c0 15.29 0 67.88 0 67.88c0.06 0.25 0.13 0.25 0.13 0.25c0 7.53 8.9 13.72 14.75 15.45c0.1 0.03 0.2 0.06 0.3 0.09c0.11 0.03 0.22 0.06 0.32 0.08l0.5 0.12l18.22 0.02c0.01 0.07 0.02 0.14 0.03 0.21c2.48 19.1 19.25 29.53 37.76 31.8c0 4.69 0 15.96 0 16.91h-0c-12.93 2.24 -24 9.94 -24 23.06h64c-0 -13.22 -11.07 -20.9 -24 -23.09h-0v-16.92c0.05 -0.01 0.1 -0.01 0.14 -0.02c18.93 -2.45 35.9 -13.31 37.45 -32.03c0.01 -0.08 3.5 -0.1 7.48 -0.1c5.28 0 11.42 0.04 11.42 0.04c0.11 -0.03 0.21 -0.05 0.32 -0.08c5.84 -1.6 15.05 -7.88 15.05 -15.54l0.13 0.75c0 0 0 -63.25 0 -72c0 -0.65 0 -1 0 -1l-32.5 0.13c-0.11 0.03 -0.21 0.05 -0.32 0.08c-0.12 0.03 -0.25 0.07 -0.37 0.11c-5.85 1.76 -14.68 7.93 -14.68 15.43h-64.25c0 -7.66 -9.21 -13.94 -15.05 -15.54c-0.11 -0.03 -0.22 -0.06 -0.32 -0.08l-32.5 -0.13z" />
-</vector>
diff --git a/app/src/main/res/drawable-v21/ic_trophy_black_48dp.xml b/app/src/main/res/drawable-v21/ic_trophy_black_48dp.xml
deleted file mode 100644
index 844b657..0000000
--- a/app/src/main/res/drawable-v21/ic_trophy_black_48dp.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="192dp"
-    android:height="192dp"
-    android:viewportWidth="192"
-    android:viewportHeight="192">
-    <path
-        android:fillColor="?attr/standardVectorGraphic"
-        android:name="Shape 1"
-        android:pathData="m48 32v56h-16v-56zm112 0v56h-16v-56zm-144 -16c0 0 0 1.52 0 4.13c0 15.29 0 67.88 0 67.88c0.06 0.25 0.13 0.25 0.13 0.25c0 7.53 8.9 13.72 14.75 15.45c0.1 0.03 0.2 0.06 0.3 0.09c0.11 0.03 0.22 0.06 0.32 0.08l0.5 0.12l18.22 0.02c0.01 0.07 0.02 0.14 0.03 0.21c2.48 19.1 19.25 29.53 37.76 31.8c0 4.69 0 15.96 0 16.91h-0c-12.93 2.24 -24 9.94 -24 23.06h64c-0 -13.22 -11.07 -20.9 -24 -23.09h-0v-16.92c0.05 -0.01 0.1 -0.01 0.14 -0.02c18.93 -2.45 35.9 -13.31 37.45 -32.03c0.01 -0.08 3.5 -0.1 7.48 -0.1c5.28 0 11.42 0.04 11.42 0.04c0.11 -0.03 0.21 -0.05 0.32 -0.08c5.84 -1.6 15.05 -7.88 15.05 -15.54l0.13 0.75c0 0 0 -63.25 0 -72c0 -0.65 0 -1 0 -1l-32.5 0.13c-0.11 0.03 -0.21 0.05 -0.32 0.08c-0.12 0.03 -0.25 0.07 -0.37 0.11c-5.85 1.76 -14.68 7.93 -14.68 15.43h-64.25c0 -7.66 -9.21 -13.94 -15.05 -15.54c-0.11 -0.03 -0.22 -0.06 -0.32 -0.08l-32.5 -0.13z" />
-</vector>
diff --git a/app/src/main/res/layout/win_screen_layout.xml b/app/src/main/res/layout/win_screen_layout.xml
index a64279a..d321fb1 100644
--- a/app/src/main/res/layout/win_screen_layout.xml
+++ b/app/src/main/res/layout/win_screen_layout.xml
@@ -4,10 +4,13 @@
     android:layout_width="fill_parent" android:layout_height="320dp"
     android:orientation="vertical"
     android:background="?attr/lightestBackGround"
-    android:layout_gravity="center">
+    android:layout_gravity="center"
+    android:layout_centerVertical="true"
+    android:layout_centerHorizontal="true">
 
     <LinearLayout
-        android:layout_width="275sp" android:layout_height="275sp"
+        android:layout_width="275sp"
+        android:layout_height="275sp"
         android:weightSum="5"
         android:background="@drawable/ic_trophy_black_48dp"
         android:orientation="horizontal"