diff --git a/app/Nova/Resources/CMS/Media/Banner.php b/app/Nova/Resources/CMS/Media/Banner.php
index d5d8c9b..eda204e 100644
--- a/app/Nova/Resources/CMS/Media/Banner.php
+++ b/app/Nova/Resources/CMS/Media/Banner.php
@@ -81,7 +81,7 @@ class Banner extends Resource
                 ID::make()->sortable(),
 
                 Images::make(__('Image'), 'main')
-                    ->conversionOnIndexView('thumb200x200')
+                    ->conversionOnIndexView('thumb400x400')
                     ->rules('required')
                     ->required(),