diff --git a/framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/ButtonGroups.cshtml b/framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/ButtonGroups.cshtml
index 90cd39f7ab..b128174d61 100644
--- a/framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/ButtonGroups.cshtml
+++ b/framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/ButtonGroups.cshtml
@@ -244,7 +244,7 @@
 <h4>Vertical variation</h4>
 
 <div class="demo-with-code">
-    <div class="demo-area">
+    <div class="demo-area text-center">
         <abp-button-group direction="Vertical">
             <abp-button button-type="Secondary">button</abp-button>
             <abp-button button-type="Secondary">button</abp-button>