message: Color picker - change placement, add light gray border, decrease shadow (win)
diff: <Popup Name="popup" x:FieldModifier="private"
  MaxHeight="300" StaysOpen="True" AllowsTransparency="True"
  PlacementTarget="{Binding ElementName=button}"
  + Placement="Left"
  + HorizontalOffset="{Binding ActualWidth, ElementName=button}"
  + VerticalOffset="{Binding ActualHeight, ElementName=button}"
  PreviewKeyDown="onPopupPreviewKeyDown"
  IsKeyboardFocusWithinChanged="onPopupKeyboardFocusWithinChanged">
  <ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled"
  - BorderThickness="0" Margin="10" Background="{DynamicResource Toggl.CardBackground}"
  + Margin="10"
  + BorderThickness="1"
  + BorderBrush="{DynamicResource Toggl.LightGrayBrush}"
  + Background="{DynamicResource Toggl.CardBackground}"
  Name="list" x:FieldModifier="private">
  <ListBox.Effect>
  - <DropShadowEffect BlurRadius="8" ShadowDepth="2" Opacity="0.3" Direction="270" />
  + <DropShadowEffect BlurRadius="4" ShadowDepth="1" Opacity="0.1" Direction="270" />
  </ListBox.Effect>
  <ListBox.ItemsPanel>
  