message: remove the top margin of the root grid, slightly weaken the shadow, fixes (win)
diff: </ResourceDictionary.MergedDictionaries>
  </ResourceDictionary>
  </Window.Resources>
  - <Grid x:Name="rootGrid" Margin="16">
  + <Grid x:Name="rootGrid" Margin="16 0 16 16">
  <Grid.Effect>
  <DropShadowEffect
  Direction="270"
  - ShadowDepth="5"
  + ShadowDepth="4"
  BlurRadius="14"
  Opacity="0.28" />
  </Grid.Effect>
  