diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index c851971..5f145c0 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -2229,8 +2229,9 @@ StScrollBar StButton#vhandle:active {
 }
 
 #lockDialogGroup {
-    background: #2e3436 url(noise-texture.png);
-    background-repeat: repeat;
+    background: #2e3436 url(/usr/share/mga/backgrounds/default.jpg);
+    background-repeat: no-repeat;
+    background-size: contain
 }
 
 .screen-shield-arrows {