diff --git a/ecs/jskult-webapp/src/static/css/masterMainte.css b/ecs/jskult-webapp/src/static/css/masterMainte.css
index 0b8b8a8e..863a9835 100644
--- a/ecs/jskult-webapp/src/static/css/masterMainte.css
+++ b/ecs/jskult-webapp/src/static/css/masterMainte.css
@@ -1,3 +1,9 @@
+/* Bootstrap 5.10以降、box-sizingのデフォルト値によってテーブルがずれるため、このページ限定的にリセット */
+/* @see https://bootstrap-guide.com/content/reboot#page-defaults */
+table {
+    box-sizing: initial;
+}
+
 body{
     background-color: LightCyan;
     font-family     : "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, Osaka, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
@@ -5,6 +11,7 @@ body{
 
 h1{
     margin-left : 1%;
+    font-weight: 700;
 }
 
 
@@ -24,7 +31,10 @@ h1{
 }
 
 .csvup_buttonSize{
-	width: 85px;
+    font-size: initial;
+}
+.buttonSize{
+    width: 85px;
 }
 
 /*////////////////////////*/
@@ -97,6 +107,7 @@ h1{
     padding-bottom: 1%;
     border-bottom: solid 1px gray;
     width: 94%;
+    border-collapse: initial;
 }
 
 .inputLabelTd{
diff --git a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
index 50a1b2bd..9cdca845 100644
--- a/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
+++ b/ecs/jskult-webapp/src/templates/instEmpCsvUL.html
@@ -12,9 +12,9 @@
             document.getElementById("loading").style.display = "block";
             document.getElementById("ulMsg").style.display = "none";
         }
-        
+
         function Form_Submit_Disp_Dialog(){
-            var msg = '{{ mainte_csv_up.select_function_message() }}';              
+            var msg = '{{ mainte_csv_up.select_function_message() }}';
             if (confirmDialog(msg)) {
                 document.getElementById("loading").style.display = "block";
                 document.getElementById("ulMsg").style.display = "none";
@@ -31,7 +31,7 @@
                 formInsertBtDisabled();
             };
         </script>
-    {% endif %} 
+    {% endif %}
   </head>
   <body>
     <!-- タイトルと上部ボタン -->
@@ -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" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">                                
-                    {% else %} 
-                        <button class="csvup_buttonSize" onclick="backToMainteMenu()">メニューへ</button>
+                        <input type="button" onclick="location.href='/masterMainte/instEmpCsvUL' " value="戻る">
+                    {% else %}
+                        <input type="button" class="csvup_buttonSize" onclick="backToMainteMenu()" value="メニューへ" />
                     {% endif %}
                 </td>
             </tr>
@@ -54,7 +54,7 @@
         method="POST" enctype="multipart/form-data"
         {% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() %}
             onsubmit="return Form_Submit_Disp_Dialog();"
-        {% else %} 
+        {% else %}
             onsubmit="Form_Submit();"
         {% endif %}
     >
@@ -65,8 +65,8 @@
                     <!-- 機能 -->
                     <td class="inputLabelTd">機能：</td>
                     <td class="inputTd">
-                        <label> 
-                            <input type="radio" name="ctrl_select_function" value="new" 
+                        <label>
+                            <input type="radio" name="ctrl_select_function" value="new"
                                 {{ "checked " if mainte_csv_up.select_function == 'new' or mainte_csv_up.is_select_function_empty() }}
                                 {{ "disabled" if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() }}
                             >
@@ -75,11 +75,11 @@
                     </td>
                     <td class="inputTd">
                         <label>
-                            <input type="radio" name="ctrl_select_function" value="change" 
+                            <input type="radio" name="ctrl_select_function" value="change"
                                 {{ "checked " if mainte_csv_up.select_function == 'change' }}
                                 {{ "disabled" if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() }}
                             >
-                            施設担当者変更                                
+                            施設担当者変更
                         </label>
                     </td>
                 </tr>
@@ -89,7 +89,7 @@
                     <td class="inputLabelTd">登録テーブル：</td>
                     <td class="inputTd">
                         <label>
-                            <input type="radio" name="ctrl_select_table" value="dummy" 
+                            <input type="radio" name="ctrl_select_table" value="dummy"
                                 {{ "checked " if mainte_csv_up.select_table == 'dummy' or mainte_csv_up.is_select_table_empty() }}
                                 {{ "disabled" if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() }}
                             >
@@ -99,8 +99,8 @@
                     <td class="inputTd">
                         <label>
                             <input type="radio" name="ctrl_select_table" value="real"
-                                {{ "checked " if mainte_csv_up.select_table == 'real' }}                                    
-                                {{ "disabled" if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() }}                                    
+                                {{ "checked " if mainte_csv_up.select_table == 'real' }}
+                                {{ "disabled" if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() }}
                             >
                             本番テーブル
                         </label>
@@ -113,7 +113,7 @@
                     <td class="input_tb" colspan="2">
                         {% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() %}
                             {{mainte_csv_up.csv_file_name}}
-                        {% else %} 
+                        {% else %}
                             <input type="file" id="excelFile" size="50" name="ctrl_csv_file" accept=".csv" onchange="formInsertBtDisabled()">
                         {% endif %}
                     </td>
@@ -133,11 +133,11 @@
                 </tr>
             </tbody>
         </table>
-{% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() %}        
+{% if mainte_csv_up.is_verified and mainte_csv_up.is_error_message_list_empty() %}
         <input name="ctrl_json_upload_data" value="{{mainte_csv_up.json_upload_data}}" type="hidden">
         <input name="ctrl_select_function" value="{{mainte_csv_up.select_function}}" type="hidden">
         <input name="ctrl_select_table" value="{{mainte_csv_up.select_table}}" type="hidden">
-{% endif %}        
+{% endif %}
     </form>
     <p>
         <!-- 処理中メッセージ表示 -->
@@ -146,7 +146,7 @@
         </div>
         {% if not mainte_csv_up.is_error_message_list_empty() %}
             <div id="ulMsg" class="footerMsg errorColor">
-                {% for error in mainte_csv_up.error_message_list %}                                    
+                {% for error in mainte_csv_up.error_message_list %}
                     {{error.error_message}}<br>
                 {% endfor %}
             </div>
@@ -157,23 +157,23 @@
                 <table class="inputData">
                     <tbody>
                         <tr>
-                            {% for column_name in mainte_csv_up.upload_data_columns() %}                                    
-                                <th>{{column_name}}</th>                                                                    
+                            {% for column_name in mainte_csv_up.upload_data_columns() %}
+                                <th>{{column_name}}</th>
                             {% endfor %}
                         </tr>
-                        {% for item in mainte_csv_up.csv_upload_list %}                         
+                        {% for item in mainte_csv_up.csv_upload_list %}
                             <tr>
                                 {% for key, value in item.csv_row.items() %}
-                                    <td>{{value}}</td>    
-                                {% endfor %}                                    
+                                    <td>{{value}}</td>
+                                {% endfor %}
                             </tr>
                         {% endfor %}
                     </tbody>
                 </table>
             </div>
-        {% elif mainte_csv_up.is_insert %}            
+        {% elif mainte_csv_up.is_insert %}
             <div id="ulMsg" class="footerMsg">
-                {% for message in mainte_csv_up.result_message_list %}  
+                {% for message in mainte_csv_up.result_message_list %}
                     {{ message }}<br>
                 {% endfor %}
             </div>
