diff --git a/backend/views/site/analytics.php b/backend/views/site/analytics.php
index e2e1723..e82f37d 100644
--- a/backend/views/site/analytics.php
+++ b/backend/views/site/analytics.php
@@ -190,7 +190,10 @@
       <?php
           echo Tabs::widget(
               [
-                  'items' => [
+                  'options' => [
+                      'class' => 'bar_tabs',
+                  ],
+                  'items'   => [
                       [
                           'label'   => 'Browsers',
                           'content' => $this->render(
--
libgit2 0.21.4