[gnome-shell-sass] style: Theme pagination arrows as per mockups

[Florian Müllner <fmuellner src gnome org>]

commit 765a65a3d33b829f79b8f3cceb41ee5001c005a5
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Jun 28 13:19:55 2022 -0300

    style: Theme pagination arrows as per mockups
    
    The style is essentially a copy of %osd_button, but adapted to
    style the inner icon instead of the whole button.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2335>

 widgets/_app-grid.scss | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/widgets/_app-grid.scss b/widgets/_app-grid.scss
index 6add597..abea753 100644
--- a/widgets/_app-grid.scss
+++ b/widgets/_app-grid.scss
@@ -146,8 +146,16 @@ $app_icon_size: 96px;
   }
 }
 
-.page-navigation-arrow > StIcon {
-  margin: 6px;
-  width: 24px;
-  height: 24px;
+.page-navigation-arrow {
+  &  > StIcon {
+    margin: 6px;
+    padding: 18px;
+    width: 24px;
+    height: 24px;
+    border-radius: 99px;
+  }
+
+  &:insensitive > StIcon { @include button(undecorated, $osd_fg_color, transparentize($osd_bg_color, 0.5));}
+  &:hover > StIcon { @include button(hover, $osd_fg_color, transparentize($osd_bg_color, 0.5));}
+  &:active > StIcon { @include button(active, $osd_fg_color, transparentize($osd_bg_color, 0.5));}
 }