diff --git a/groups/home/bootstrap5/az/css.html b/groups/home/bootstrap5/az/css.html
index 6a04f60..a50d058 100644
--- a/groups/home/bootstrap5/az/css.html
+++ b/groups/home/bootstrap5/az/css.html
@@ -25,4 +25,7 @@
 #s-lib-public-header-desc { margin-top: -30px; }
 #s-lib-public-main-searchbar { margin-top: -20px; }
 
+/*change the background color of the header */
+.navbar-expand-lg { background-color: #003466 !important; }  /* color navbar when at full screen */
+#az-public-mobile-filters { background-color: #003466; }  /* color navbar when on mobile */
 </style>