[gnome-nibbles/arnaudb/wip/gtk4] Fix dialogs background.

[Arnaud B. <arnaudb src gnome org>]

commit ae3654b96091518ea5ecb95b272f97e1056a2409
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Jun 17 16:03:56 2020 +0200

    Fix dialogs background.

 data/nibbles.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/nibbles.css b/data/nibbles.css
index 84a5d19..77910f5 100644
--- a/data/nibbles.css
+++ b/data/nibbles.css
@@ -1,4 +1,4 @@
-window {
+window:not(.dialog) {
   background-color: rgba(0, 0, 0, 1);
 }