diff --git a/userChrome.css b/userChrome.css
index 66e4fabc..5a1a37fc 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -27,7 +27,7 @@
     background-image: var(--lwt-header-image)  !important; /* Original: var(--lwt-header-image) */
     background-repeat: no-repeat !important;
     background-position: right top !important;
-    background-size : cover;
+    background-size : contain;
   }
   :root[lwtheme-image] #navigator-toolbox:-moz-lwtheme {
     background-image:    var(--lwt-additional-images) !important; /* Original: var(--lwt-header-image), var(--lwt-additional-images); */