[gnome-text-editor] css: tweak follow system theme border in dark mode

[Christian Hergert <chergert src gnome org>]

commit 11e45ffb51a820a9bbe12c98e3c2dde2bc4dd004
Author: Christian Hergert <chergert redhat com>
Date:   Fri Nov 19 15:10:54 2021 -0800

    css: tweak follow system theme border in dark mode
    
    This looks better than having a single border color for both light and
    dark themes.
    
    Related #225

 src/TextEditor.css | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/TextEditor.css b/src/TextEditor.css
index cc7d13d..fbed012 100644
--- a/src/TextEditor.css
+++ b/src/TextEditor.css
@@ -49,6 +49,9 @@
   background: linear-gradient(to bottom right, #fff 50%, #2e3436 50%);
   border-color: #2e3436;
 }
+.org-gnome-TextEditor.dark checkbutton.theme-selector.follow {
+  border-color: #dcdddd;
+}
 .org-gnome-TextEditor checkbutton.theme-selector.light {
   background-color: #fff;
   border-color: #dcdddd;