[gnome-builder] greeter: soften corners of greeter list

[Christian Hergert <chergert src gnome org>]

commit 989443075adf73cebcf2a75b1d31daf0332aad0a
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 7 14:19:17 2022 -0800

    greeter: soften corners of greeter list
    
    Feels a bit closer to other more modern GTK styling on the desktop. And we
    need a bit of a stop gap until we get to GTK 4.

 src/libide/themes/themes/shared/shared-greeter.css | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/themes/themes/shared/shared-greeter.css 
b/src/libide/themes/themes/shared/shared-greeter.css
index b5c27e882..0db2f0a80 100644
--- a/src/libide/themes/themes/shared/shared-greeter.css
+++ b/src/libide/themes/themes/shared/shared-greeter.css
@@ -4,14 +4,27 @@
  * The following tweaks the greeter surface by adding
  * separator lines to the list box.
  */
+.greeter list {
+  background: transparent;
+}
 .greeter list row {
   border-bottom: 1px solid alpha(@borders, 0.2);
   transition-property: background, opacity;
 }
+.greeter list row:first-child {
+  border-top-right-radius: 9px;
+  border-top-left-radius: 9px;
+}
 .greeter list row:last-child {
   border-bottom: none;
+  border-bottom-right-radius: 9px;
+  border-bottom-left-radius: 9px;
+}
+.greeter frame {
+  background: @content_view_bg;
+  border-radius: 9px;
 }
 .greeter frame border {
   border-color: alpha(@borders, 0.6);
+  border-radius: 9px;
 }
-