Issue #3155464 by elij, quinns: navbar-toggler-icon not appearing

css/components/navigation.css

@@ -95,4 +95,9 @@ ul.dropdown-menu {
 /* Make sure links in the active trail reverse out to white so that they do not diappear when the LIs highlight */
 .dropdown-menu li.active>a {
   color: #fff;
-}
+}
\ No newline at end of file
+
+/* Menu toggler fall back icon */
+.navbar-toggler-icon {
+  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%280, 0, 0, 0.5%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
+}