diff --git a/SpineViewer/Views/AboutDialog.xaml b/SpineViewer/Views/AboutDialog.xaml
index 3be6fbb..393cbe6 100644
--- a/SpineViewer/Views/AboutDialog.xaml
+++ b/SpineViewer/Views/AboutDialog.xaml
@@ -8,6 +8,7 @@
         d:DataContext="{d:DesignInstance Type=viewmodels:AboutDialogViewModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_Abount}"
+        Background="{StaticResource RegionBrush}"
         Height="300"
         Width="500"
         ShowInTaskbar="False"
diff --git a/SpineViewer/Views/DiagnosticsDialog.xaml b/SpineViewer/Views/DiagnosticsDialog.xaml
index 6ba4427..04a60e8 100644
--- a/SpineViewer/Views/DiagnosticsDialog.xaml
+++ b/SpineViewer/Views/DiagnosticsDialog.xaml
@@ -8,6 +8,7 @@
         d:DataContext="{d:DesignInstance Type=viewmodels:DiagnosticsDialogViewModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_Diagnostics}"
+        Background="{StaticResource RegionBrush}"
         Height="450" 
         Width="800"    
         ShowInTaskbar="False"
diff --git a/SpineViewer/Views/ExporterDialogs/CustomFFmpegExporterDialog.xaml b/SpineViewer/Views/ExporterDialogs/CustomFFmpegExporterDialog.xaml
index b0ffb83..6843ebe 100644
--- a/SpineViewer/Views/ExporterDialogs/CustomFFmpegExporterDialog.xaml
+++ b/SpineViewer/Views/ExporterDialogs/CustomFFmpegExporterDialog.xaml
@@ -10,6 +10,7 @@
         d:DataContext="{d:DesignInstance Type=exporters:CustomFFmpegExporterViewModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_CustomFFmpegExporterTitle}"
+        Background="{StaticResource RegionBrush}"
         Width="450"
         Height="800"
         ShowInTaskbar="False"
@@ -47,7 +48,6 @@
                     <Setter Property="HorizontalAlignment" Value="Right"/>
                 </Style>
                 <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource GroupBoxTab}">
-                    <Setter Property="BorderBrush" Value="LightGray"/>
                     <Setter Property="Background" Value="Transparent"/>
                     <Setter Property="hc:TitleElement.Background" Value="Transparent"/>
                     <Setter Property="Margin" Value="0 5 0 10"/>
diff --git a/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml b/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
index 721a10b..f6f3c75 100644
--- a/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
+++ b/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
@@ -10,6 +10,7 @@
         d:DataContext="{d:DesignInstance Type=vmexp:FFmpegVideoExporterViewModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_FFmpegVideoExporterTitle}"
+        Background="{StaticResource RegionBrush}"
         Width="450"
         Height="750"
         ShowInTaskbar="False"
@@ -47,7 +48,6 @@
                     <Setter Property="HorizontalAlignment" Value="Right"/>
                 </Style>
                 <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource GroupBoxTab}">
-                    <Setter Property="BorderBrush" Value="LightGray"/>
                     <Setter Property="Background" Value="Transparent"/>
                     <Setter Property="hc:TitleElement.Background" Value="Transparent"/>
                     <Setter Property="Margin" Value="0 5 0 10"/>
diff --git a/SpineViewer/Views/ExporterDialogs/FrameExporterDialog.xaml b/SpineViewer/Views/ExporterDialogs/FrameExporterDialog.xaml
index 0c54cac..9feab6c 100644
--- a/SpineViewer/Views/ExporterDialogs/FrameExporterDialog.xaml
+++ b/SpineViewer/Views/ExporterDialogs/FrameExporterDialog.xaml
@@ -10,6 +10,7 @@
         d:DataContext="{d:DesignInstance Type=vmexp:FrameExporterViewModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_FrameExporterTitle}" 
+        Background="{StaticResource RegionBrush}"
         Width="450"
         Height="480"
         ShowInTaskbar="False"
@@ -47,7 +48,6 @@
                     <Setter Property="HorizontalAlignment" Value="Right"/>
                 </Style>
                 <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource GroupBoxTab}">
-                    <Setter Property="BorderBrush" Value="LightGray"/>
                     <Setter Property="Background" Value="Transparent"/>
                     <Setter Property="hc:TitleElement.Background" Value="Transparent"/>
                     <Setter Property="Margin" Value="0 5 0 10"/>
diff --git a/SpineViewer/Views/ExporterDialogs/FrameSequenceExporterDialog.xaml b/SpineViewer/Views/ExporterDialogs/FrameSequenceExporterDialog.xaml
index 34ff9c7..3097f38 100644
--- a/SpineViewer/Views/ExporterDialogs/FrameSequenceExporterDialog.xaml
+++ b/SpineViewer/Views/ExporterDialogs/FrameSequenceExporterDialog.xaml
@@ -9,7 +9,8 @@
         xmlns:vmexp="clr-namespace:SpineViewer.ViewModels.Exporters"
         d:DataContext="{d:DesignInstance Type=vmexp:FrameSequenceExporterViewModel}"
         mc:Ignorable="d"
-        Title="{DynamicResource Str_FrameSequenceExporterTitle}" 
+        Title="{DynamicResource Str_FrameSequenceExporterTitle}"
+        Background="{StaticResource RegionBrush}"
         Width="450"
         Height="550"
         ShowInTaskbar="False"
@@ -47,7 +48,6 @@
                     <Setter Property="HorizontalAlignment" Value="Right"/>
                 </Style>
                 <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource GroupBoxTab}">
-                    <Setter Property="BorderBrush" Value="LightGray"/>
                     <Setter Property="Background" Value="Transparent"/>
                     <Setter Property="hc:TitleElement.Background" Value="Transparent"/>
                     <Setter Property="Margin" Value="0 5 0 10"/>
diff --git a/SpineViewer/Views/MainWindow.xaml b/SpineViewer/Views/MainWindow.xaml
index 18dabdf..65af3c1 100644
--- a/SpineViewer/Views/MainWindow.xaml
+++ b/SpineViewer/Views/MainWindow.xaml
@@ -954,14 +954,15 @@
                                                     <hc:ColorPicker Confirmed="ColorPicker_Confirmed" Canceled="ColorPicker_Canceled"/>
                                                 </Popup>
                                             </Border>
-                                            <Button DockPanel.Dock="Right"
-                                                    Content="..."
+                                            <Border DockPanel.Dock="Right" Background="White" CornerRadius="{DynamicResource DefaultCornerRadius}">
+                                                <Button Content="..."
                                                     Foreground="{Binding BackgroundColor, Converter={StaticResource Bg2FgCvter}}"
                                                     Click="ButtonPickColor_Click">
-                                                <Button.Background>
-                                                    <SolidColorBrush Color="{Binding BackgroundColor}"/>
-                                                </Button.Background>
-                                            </Button>
+                                                    <Button.Background>
+                                                        <SolidColorBrush Color="{Binding BackgroundColor}"/>
+                                                    </Button.Background>
+                                                </Button>
+                                            </Border>
                                             <TextBox Text="{Binding BackgroundColor}" ToolTip="#AARRGGBB"/>
                                         </DockPanel>
                                     </Grid>
diff --git a/SpineViewer/Views/PreferenceDialog.xaml b/SpineViewer/Views/PreferenceDialog.xaml
index a1946a3..19625ec 100644
--- a/SpineViewer/Views/PreferenceDialog.xaml
+++ b/SpineViewer/Views/PreferenceDialog.xaml
@@ -10,6 +10,7 @@
         d:DataContext="{d:DesignInstance Type=models:PreferenceModel}"
         mc:Ignorable="d"
         Title="{DynamicResource Str_Preference}"
+        Background="{StaticResource RegionBrush}"
         Height="650" 
         Width="600"    
         ShowInTaskbar="False"
@@ -44,7 +45,6 @@
                     <Setter Property="HorizontalAlignment" Value="Right"/>
                 </Style>
                 <Style TargetType="{x:Type GroupBox}" BasedOn="{StaticResource GroupBoxTab}">
-                    <Setter Property="BorderBrush" Value="LightGray"/>
                     <Setter Property="Background" Value="Transparent"/>
                     <Setter Property="hc:TitleElement.Background" Value="Transparent"/>
                     <Setter Property="Margin" Value="0 5 0 10"/>
diff --git a/SpineViewer/Views/ProgressDialog.xaml b/SpineViewer/Views/ProgressDialog.xaml
index 6902755..a0188d3 100644
--- a/SpineViewer/Views/ProgressDialog.xaml
+++ b/SpineViewer/Views/ProgressDialog.xaml
@@ -9,6 +9,7 @@
         d:DataContext="{d:DesignInstance Type=vm:ProgressDialogViewModel}"
         mc:Ignorable="d"
         Title="{Binding Title}"
+        Background="{StaticResource RegionBrush}"
         Width="550"
         Height="250"
         ResizeMode="NoResize"