diff --git a/ecs/jskult-webapp/src/static/css/masterMainte.css b/ecs/jskult-webapp/src/static/css/masterMainte.css
index 07f8bbe8..95cdc6e5 100644
--- a/ecs/jskult-webapp/src/static/css/masterMainte.css
+++ b/ecs/jskult-webapp/src/static/css/masterMainte.css
@@ -30,7 +30,7 @@ h1{
     width: 20%;
 }
 
-.csvup_buttonSize{
+.header_buttonSize{
     width: 7rem;
     font-size: initial;
 }
diff --git a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
index 35ae1087..9968a6f4 100644
--- a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
+++ b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
@@ -41,9 +41,9 @@
                 <td class="headerTdLeft">施設担当者データCSVアップロード</td>
                 <td class="headerTdRight">
                     {% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty()  %}
-                        <input type="button" class="csvup_buttonSize" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">
+                        <input type="button" class="header_buttonSize" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">
                     {% else %}
-                        <input type="button" class="csvup_buttonSize" onclick="backToMainteMenu()" value="メニューへ" />
+                        <input type="button" class="header_buttonSize" onclick="backToMainteMenu()" value="メニューへ" />
                     {% endif %}
                 </td>
             </tr>