Update background choices

src/PicView.Avalonia/ColorManagement/BackgroundManager.cs

@@ -24,8 +24,8 @@ public static class BackgroundManager
         4 => new SolidColorBrush(Colors.White),
         5 => new SolidColorBrush(Color.FromRgb(200, 200, 200)),
         6 => new SolidColorBrush(Color.FromRgb(155, 155, 155)),
-        7 => new SolidColorBrush(Color.FromArgb(90, 35, 35, 35)),
-        8 => new SolidColorBrush(Color.FromArgb(90, 15, 15, 15)),
+        7 => new SolidColorBrush(Color.FromArgb(200, 100, 100, 100)),
+        8 => new SolidColorBrush(Color.FromArgb(200, 50, 50, 50)),
         9 => new SolidColorBrush(Color.FromRgb(5, 5, 5)),
         _ => new SolidColorBrush(Colors.Transparent)
     };

src/PicView.Avalonia/Views/AppearanceView.axaml

@@ -237,21 +237,21 @@
 
             <!--  Dark Gray  -->
             <Button
-                Background="#969696"
+                Background="#9B9B9B"
                 Classes="colorBtn"
                 Click="BgButton_OnClick"
                 x:Name="DarkGrayBgButton" />
 
             <!--  Dark Gray Semi Transparent  -->
             <Button
-                Background="#5A232323"
+                Background="#C8646464"
                 Classes="colorBtn"
                 Click="BgButton_OnClick"
                 x:Name="DarkGraySemiTransparentBgButton" />
 
             <!--  Dark Gray Semi Transparent Alt  -->
             <Button
-                Background="#5A0F0F0F"
+                Background="#C8323232"
                 Classes="colorBtn"
                 Click="BgButton_OnClick"
                 x:Name="DarkGraySemiTransparentAltBgButton" />