diff --git a/django/contrib/admin/templates/admin/base.html b/django/contrib/admin/templates/admin/base.html
index 23cae64ee5..271f774fde 100644
--- a/django/contrib/admin/templates/admin/base.html
+++ b/django/contrib/admin/templates/admin/base.html
@@ -69,7 +69,7 @@
     {% endblock %}
     {% endif %}
 
-    <div class="main shifted" id="main">
+    <div class="main" id="main">
       {% if not is_popup and is_nav_sidebar_enabled %}
         {% block nav-sidebar %}
           {% include "admin/nav_sidebar.html" %}
diff --git a/tests/admin_views/test_nav_sidebar.py b/tests/admin_views/test_nav_sidebar.py
index b3d4955b19..be1cfb5209 100644
--- a/tests/admin_views/test_nav_sidebar.py
+++ b/tests/admin_views/test_nav_sidebar.py
@@ -39,6 +39,7 @@ class AdminSidebarTests(TestCase):
 
     def test_sidebar_not_on_index(self):
         response = self.client.get(reverse('test_with_sidebar:index'))
+        self.assertContains(response, '<div class="main" id="main">')
         self.assertNotContains(response, '<nav class="sticky" id="nav-sidebar">')
 
     def test_sidebar_disabled(self):