bottom view margin

catalog/src/main/res/layout/activity_main.xml

@@ -42,7 +42,9 @@
  <fragment
  android:id="@+id/nav_host_fragment"
  android:layout_width="match_parent"
- android:layout_height="wrap_content"
+ android:layout_height="match_parent"
+ android:layout_marginTop="56dp"
+ android:layout_marginBottom="56dp"
  android:name="androidx.navigation.fragment.NavHostFragment"
  app:defaultNavHost="true"
  app:layout_constraintTop_toBottomOf="@+id/toolbar"