Index: gnome-shell-3.34.1+7/data/gnome-shell-theme.gresource.xml
===================================================================
--- gnome-shell-3.34.1+7.orig/data/gnome-shell-theme.gresource.xml
+++ gnome-shell-3.34.1+7/data/gnome-shell-theme.gresource.xml
@@ -31,5 +31,6 @@
     <file>toggle-on.svg</file>
     <file>toggle-on-dark.svg</file>
     <file>toggle-on-hc.svg</file>
+    <file>sle-background.png</file>
   </gresource>
 </gresources>
Index: gnome-shell-3.34.1+7/data/theme/gnome-shell-sass/_common.scss
===================================================================
--- gnome-shell-3.34.1+7.orig/data/theme/gnome-shell-sass/_common.scss
+++ gnome-shell-3.34.1+7/data/theme/gnome-shell-sass/_common.scss
@@ -1919,6 +1919,9 @@ StScrollBar {
   max-width: 23em;
 }
 
+.login-dialog-sle {
+  background: #2e3436 url(sle-background.png); }
+
 .login-dialog {
   //reset
   border: none;
Index: gnome-shell-3.34.1+7/js/ui/unlockDialog.js
===================================================================
--- gnome-shell-3.34.1+7.orig/js/ui/unlockDialog.js
+++ gnome-shell-3.34.1+7/js/ui/unlockDialog.js
@@ -23,6 +23,7 @@ var UnlockDialog = GObject.registerClass
             visible: false,
         });
 
+        this.add_style_class_name('login-dialog-sle');
         this.add_constraint(new Layout.MonitorConstraint({ primary: true }));
         parentActor.add_child(this);