[gnome-builder/wip/gtk4-port: 591/736] libide/gui: fix styling of buttons in notification stack

[Christian Hergert <chergert src gnome org>]

commit 2ddcde6a3889d88165e392f716ec7b21163438b1
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 15 09:43:52 2022 -0700

    libide/gui: fix styling of buttons in notification stack

 src/libide/gui/style.css | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libide/gui/style.css b/src/libide/gui/style.css
index ec880e99c..dfecc5105 100644
--- a/src/libide/gui/style.css
+++ b/src/libide/gui/style.css
@@ -54,3 +54,9 @@ window popover.global-search contents {
 window popover.global-search .navigation-sidebar {
   border-right: 1px solid @borders;
 }
+
+notificationstack button {
+  margin: 0;
+  padding: 0;
+  background: none;
+}