application.html.erb in rails_admin-3.1.0.beta

- old
+ new

@@ -3,10 +3,10 @@
   <head>
     <%= render "layouts/rails_admin/head" %>
   </head>
   <body class="rails_admin">
     <div data-i18n-options="<%= I18n.t("admin.js").to_json %>" id="admin-js"></div>
-    <nav class="navbar navbar-expand-md fixed-top navbar-dark bg-primary border-bottom">
+    <nav class="navbar navbar-expand-md fixed-top <%= RailsAdmin::Config.navbar_css_classes.join(' ') %>">
       <%= render "layouts/rails_admin/navigation" %>
     </nav>
     <div class="container-fluid">
       <div class="row">
         <div class="col-sm-3 col-md-2 flex-wrap p-0">