massage the colors a little more

ntfysh_client/NotificationDialog.cs

@@ -122,6 +122,7 @@ namespace ntfysh_client
 
             // this one is not "hiding"
             ButtonClose.BackColor = _theme.ControlBackGroundColor;
+            ButtonClose.ForeColor = _theme.BackgroundColor;
             // handle mouse over
             ButtonClose.FlatAppearance.MouseOverBackColor = _theme.ControlMouseOverBackgroundColor;
 
@@ -131,7 +132,6 @@ namespace ntfysh_client
             TxBMessage.ForeColor = _theme.ForegroundColor;
             LblTimeout.ForeColor = _theme.ForegroundColor;
             ProgressBar1.ForeColor = _theme.ForegroundColor;
-            ButtonClose.ForeColor = _theme.ForegroundColor;
         }
 
         private void UpdateProgress(object? sender, EventArgs e)

ntfysh_client/Themes/DarkModeTheme.cs

@@ -7,6 +7,6 @@ namespace ntfysh_client.Themes
         public override Color BackgroundColor { get => SystemColors.ControlDark; }
         public override Color ControlBackGroundColor { get => Color.Black; }
         public override Color ControlMouseOverBackgroundColor { get => Color.Silver; }
-        public override Color ForegroundColor { get => SystemColors.ControlLight; }
+        public override Color ForegroundColor { get => SystemColors.WindowText; }
     }
 }