Let MediaBoxView be in front of Toolbar

src/main/res/layout/activity_reader.xml

@@ -232,7 +232,9 @@
     <com.kdanmobile.reader.screen.reader.mediabox.MediaBoxView
         android:id="@+id/mediaBoxView"
         android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="match_parent"
+        android:translationZ="100dp"
+        tools:ignore="UnusedAttribute" />
 
     <include
         android:id="@+id/view_ink_menu"