diff --git a/seiseki.html b/seiseki.html
index dfba96b..442f4f4 100644
--- a/seiseki.html
+++ b/seiseki.html
@@ -1,26 +1,64 @@
-<!DOCTYPE html>
-<!-- saved from url=(0022)http://127.0.0.1:5000/ -->
-<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+
+    <!DOCTYPE html>
+    <html lang="ja">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <title>成績管理レポート</title>
         <style>
-            body { font-family: "Helvetica Neue", Arial, "Meiryo", sans-serif; background-color: #f0f5f0; padding: 30px; }
-            .container { background-color: #ffffff; border-radius: 12px; padding: 25px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); max-width: 1000px; margin: auto; border-top: 10px solid #2e7d32; }
-            h2 { color: #1b5e20; text-align: center; margin-bottom: 20px; }
-            
-            .styled-table { width: 100%; border-collapse: collapse; }
-            th { background-color: #2e7d32; color: white; padding: 12px; border: 1px solid #1b5e20; font-size: 0.9rem; }
-            
-            /* 全ての文字を黒色（#000）に統一 */
-            td { padding: 10px; border: 1px solid #e0e0e0; text-align: center; font-size: 0.9rem; color: #000; }
-            
-            tr:nth-child(even) { background-color: #f9fbf9; }
-            tr:hover { background-color: #f1f8e9; }
-            
-            /* 合計と平均のセルも黒色のまま太字にする */
+            /* 外部ファイルを必要としないデザイン設定 */
+            body { 
+                font-family: "Helvetica Neue", Arial, "Meiryo", sans-serif; 
+                background-color: #f0f5f0; 
+                margin: 0; 
+                padding: 40px 20px; 
+            }
+            .container { 
+                background-color: #ffffff; 
+                border-radius: 12px; 
+                padding: 30px; 
+                box-shadow: 0 4px 20px rgba(0,0,0,0.1); 
+                max-width: 1100px; 
+                margin: auto; 
+                border-top: 10px solid #2e7d32; 
+            }
+            h2 { 
+                color: #1b5e20; 
+                text-align: center; 
+                margin-bottom: 25px; 
+                font-size: 1.8rem;
+            }
+            table { 
+                width: 100%; 
+                border-collapse: collapse; 
+                margin-top: 10px;
+                color: #000; /* 全ての文字を黒に固定 */
+            }
+            th { 
+                background-color: #2e7d32; 
+                color: white; 
+                padding: 12px; 
+                border: 1px solid #1b5e20; 
+                font-weight: bold;
+                white-space: nowrap;
+            }
+            td { 
+                padding: 12px; 
+                border: 1px solid #e0e0e0; 
+                text-align: center; 
+                font-size: 0.95rem;
+                color: #000; /* 全ての文字を黒に固定 */
+            }
+            tr:nth-child(even) { 
+                background-color: #f9fbf9; 
+            }
+            tr:hover { 
+                background-color: #f1f8e9; 
+            }
+            /* 合計と平均の強調 */
             .styled-table td:nth-last-child(1), 
             .styled-table td:nth-last-child(2) {
                 font-weight: bold;
-                color: #000;
             }
         </style>
     </head>
@@ -344,6 +382,6 @@
   </tbody>
 </table>
         </div>
-    
-    
-    </body></html>
\ No newline at end of file
+    </body>
+    </html>
+    
\ No newline at end of file
