correction visual

Tetris/app/src/main/res/layout/fragment_option.xml

@@ -9,17 +9,11 @@
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:orientation="vertical"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.5"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.5">
+        android:orientation="vertical">
 
         <Button
             android:id="@+id/backButton"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/retour"
             />