diff --git a/web/app/controllers/problem_data_manage.php b/web/app/controllers/problem_data_manage.php
index 7f6c0b4..8f9cd30 100644
--- a/web/app/controllers/problem_data_manage.php
+++ b/web/app/controllers/problem_data_manage.php
@@ -679,7 +679,7 @@ EOD
 
 <div class="row">
 <!-- left col -->
-<div class="col">
+<div class="col-12 col-lg-9">
 
 <h1 class="h2">
 	#<?=$problem['id']?>. <?=$problem['title']?> 管理