[gnome-shell/wip/jimmac/login-back-button] styling: Update for darker system grey

[Jakub Steiner <jimmac src gnome org>]

commit a35af9ddce7633cc51c2c1affa4b23f5a1e0819c
Author: Jakub Steiner <jimmac gmail com>
Date:   Tue Mar 9 20:22:37 2021 +0100

    styling: Update for darker system grey
    
    Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3847

 data/theme/gnome-shell-sass/widgets/_login-dialog.scss | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/data/theme/gnome-shell-sass/widgets/_login-dialog.scss 
b/data/theme/gnome-shell-sass/widgets/_login-dialog.scss
index 78d2a2af3f..d6608fc307 100644
--- a/data/theme/gnome-shell-sass/widgets/_login-dialog.scss
+++ b/data/theme/gnome-shell-sass/widgets/_login-dialog.scss
@@ -11,13 +11,13 @@
   border: none;
   background-color: transparent;
 
-  $_gdm_bg: lighten(#2e3436, 19%);
+  $_gdm_bg: $system_bg_color;
 
   StEntry {
     @if $variant=='dark' {
-      $_gdm_entry_bg: transparentize(lighten(desaturate(#241f31, 20%), 2%), 0.5);
+      $_gdm_entry_bg: darken($system_bg_color, 3%);
       background-color: $_gdm_entry_bg;
-      color: $osd_fg_color;
+      color: $fg_color;
     }
   }
 
@@ -25,9 +25,9 @@
   .modal-dialog-button {
     padding: 4px 18px;
     box-shadow: 0 1px 3px rgba(0,0,0,0.2);
-    background-color: $_gdm_bg;
-    border-color: $_gdm_bg;
-    color: $fg_color;
+    background-color: darken($system_bg_color, 3%);
+    border-color: darken($system_bg_color, 3%);
+    color: $osd_fg_color;
 
     $_hover_c: lighten($_gdm_bg, 5%);
     &:hover, &:focus {
@@ -44,7 +44,7 @@
       @include button(insensitive);
       border-color: darken($_gdm_bg, 5%);
       background-color: darken($_gdm_bg, 5%);
-      color: transparentize($fg_color, 0.3);
+      color: transparentize($osd_fg_color, 0.3);
     }
     &:default {
       @include button(normal, $c:$selected_bg_color, $tc:$selected_fg_color);
@@ -77,8 +77,8 @@
     border-radius: 99px;
     width: $base_icon_size * 2;
     height: $base_icon_size * 2;
-    border-color: transparentize($bg_color,0.7);
-    background-color: transparentize($bg_color,0.7);
+    border-color: darken($system_bg_color, 3%);
+    background-color: darken($system_bg_color, 3%);
 
     StIcon { icon-size: $base_icon_size; }
   }