Create a shared project with all Win App common files (8.1 and 10)

Finally use the dependency injected Resource Service

WinAppCommon/Extensions/ColorExtensions.cs

@@ -0,0 +1,18 @@
+using System.Drawing;
+using Windows.UI.Xaml.Media;
+
+namespace ModernKeePass.Extensions
+{
+    public static class ColorExtensions
+    {
+        public static Color ToColor(this SolidColorBrush brush)
+        {
+            return Color.FromArgb(brush.Color.A, brush.Color.R, brush.Color.G, brush.Color.B);
+        }
+
+        public static SolidColorBrush ToSolidColorBrush(this Color color)
+        {
+            return new SolidColorBrush(Windows.UI.Color.FromArgb(color.A, color.R, color.G, color.B));
+        }
+    }
+}