[gnome-shell-sass] style: Adjust close button style

[Florian Müllner <fmuellner src gnome org>]

commit 7056167e59cb33695fa7a713cc26f9fd729e2c07
Author: Sam Hewitt <sam snwh org>
Date:   Fri May 27 13:24:28 2022 -0230

    style: Adjust close button style
    
    - fixes #5481
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2309>

 widgets/_window-picker.scss | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/widgets/_window-picker.scss b/widgets/_window-picker.scss
index 84aaa43..1d30e0f 100644
--- a/widgets/_window-picker.scss
+++ b/widgets/_window-picker.scss
@@ -5,7 +5,7 @@ $window_picker_padding: $base_padding * 2; // 12px
 
 $window_thumbnail_label_color: transparentize($osd_bg_color, 0.4);
 
-$window_close_button_color: darken(transparentize($osd_bg_color, .05), 3%);
+$window_close_button_color: lighten(transparentize($osd_bg_color, .05), 7%);
 $window_close_button_size: 30px;
 $window_close_button_padding: 3px;
 
@@ -28,6 +28,7 @@ $window_close_button_padding: 3px;
   background-color: $window_close_button_color;
   color: $osd_fg_color;
   border-radius: 99px;
+  box-shadow: 0 2px 4px 0 $shadow_color;
   padding: $window_close_button_padding;
   height: $window_close_button_size;
   width: $window_close_button_size;