diff --git a/public/sample/php/final-work/twitter/index.php b/public/sample/php/final-work/twitter/index.php
index bec669f..521d721 100644
--- a/public/sample/php/final-work/twitter/index.php
+++ b/public/sample/php/final-work/twitter/index.php
@@ -20,28 +20,29 @@
       box-sizing: border-box;
     }
     body {
-      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
-      background-color: #f0f2f5;
+      font-family: Arial, sans-serif;
+      background-color: #f5f5f5;
       padding: 20px;
     }
     .container {
       max-width: 600px;
       margin: 0 auto;
       background: white;
-      border-radius: 8px;
-      box-shadow: 0 1px 3px rgba(0,0,0,0.1);
+      border: 2px solid #333;
     }
     .header {
       padding: 20px;
-      border-bottom: 1px solid #e1e8ed;
+      border-bottom: 2px solid #333;
+      background: #fff;
     }
     h1 {
-      font-size: 20px;
-      color: #1da1f2;
+      font-size: 18px;
+      color: #333;
+      font-weight: normal;
     }
     .post-form {
       padding: 20px;
-      border-bottom: 1px solid #e1e8ed;
+      border-bottom: 2px solid #333;
     }
     .form-group {
       margin-bottom: 15px;
@@ -49,118 +50,130 @@
     label {
       display: block;
       margin-bottom: 5px;
-      font-weight: 600;
-      font-size: 14px;
-      color: #657786;
+      font-size: 12px;
+      color: #666;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
     }
     input[type="text"] {
       width: 100%;
-      padding: 10px;
-      border: 1px solid #e1e8ed;
-      border-radius: 4px;
+      padding: 8px;
+      border: 1px solid #999;
+      background: white;
       font-size: 14px;
+      font-family: Arial, sans-serif;
     }
     textarea {
       width: 100%;
-      padding: 10px;
-      border: 1px solid #e1e8ed;
-      border-radius: 4px;
-      font-size: 15px;
+      padding: 8px;
+      border: 1px solid #999;
+      background: white;
+      font-size: 14px;
       resize: vertical;
       min-height: 80px;
-      font-family: inherit;
+      font-family: Arial, sans-serif;
     }
     button {
-      background-color: #1da1f2;
-      color: white;
-      border: none;
-      padding: 10px 20px;
-      border-radius: 9999px;
-      font-weight: 600;
+      background-color: white;
+      color: #333;
+      border: 2px solid #333;
+      padding: 8px 16px;
+      font-weight: normal;
       font-size: 14px;
       cursor: pointer;
-      transition: background-color 0.2s;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
     }
     button:hover {
-      background-color: #1a91da;
+      background-color: #333;
+      color: white;
     }
     .timeline {
       padding: 0;
     }
     .timeline-header {
       padding: 15px 20px;
-      border-bottom: 1px solid #e1e8ed;
-      font-weight: 700;
-      font-size: 16px;
+      border-bottom: 1px solid #ddd;
+      font-weight: normal;
+      font-size: 14px;
+      background: #fafafa;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
     }
     .tweet {
-      padding: 15px 20px;
-      border-bottom: 1px solid #e1e8ed;
-      transition: background-color 0.2s;
+      padding: 20px;
+      border-bottom: 1px solid #ddd;
     }
-    .tweet:hover {
-      background-color: #f7f9fa;
+    .tweet:last-child {
+      border-bottom: none;
     }
     .tweet-header {
       display: flex;
       justify-content: space-between;
-      margin-bottom: 8px;
+      margin-bottom: 10px;
+      padding-bottom: 8px;
+      border-bottom: 1px solid #eee;
     }
     .username {
-      font-weight: 700;
-      color: #14171a;
-      font-size: 15px;
+      font-weight: bold;
+      color: #333;
+      font-size: 14px;
     }
     .timestamp {
-      color: #657786;
-      font-size: 13px;
+      color: #999;
+      font-size: 12px;
     }
     .tweet-content {
-      color: #14171a;
-      font-size: 15px;
-      line-height: 1.5;
+      color: #333;
+      font-size: 14px;
+      line-height: 1.6;
       word-wrap: break-word;
     }
     .empty-state {
-      padding: 40px 20px;
+      padding: 60px 20px;
       text-align: center;
-      color: #657786;
+      color: #999;
+      border: 2px dashed #ddd;
+      margin: 20px;
+    }
+    .empty-state p {
+      font-size: 14px;
     }
   </style>
 </head>
 <body>
   <div class="container">
     <div class="header">
-      <h1>🐦 Twitterライク</h1>
+      <h1>[ Twitterライク ]</h1>
     </div>
     
     <div class="post-form">
-      <form method="post" action="post.php">
+      <form method="post" action="post.php" onsubmit="event.preventDefault(); alert('送信ボタンを押すと、タイムラインに投稿が追加される想定です！\n実際の実装では post.php にデータが送信されます。');">
         <div class="form-group">
-          <label>ユーザー名</label>
+          <label>User Name</label>
           <input type="text" name="username" maxlength="50" placeholder="名前を入力" required>
         </div>
         <div class="form-group">
-          <label>つぶやき</label>
+          <label>Tweet</label>
           <textarea name="content" maxlength="280" placeholder="いまどうしてる？" required></textarea>
         </div>
-        <button type="submit">ツイートする</button>
+        <button type="submit">Post Tweet</button>
       </form>
     </div>
     
     <div class="timeline">
-      <div class="timeline-header">タイムライン</div>
+      <div class="timeline-header">Timeline</div>
       
       <?php if (empty($tweets)): ?>
         <div class="empty-state">
-          <p>まだ投稿がありません</p>
-          <p style="font-size: 13px; margin-top: 8px;">最初のツイートをしてみましょう！</p>
+          <p>[ No Tweets Yet ]</p>
+          <p style="font-size: 12px; margin-top: 8px;">最初のツイートをしてみましょう</p>
         </div>
       <?php else: ?>
         <?php foreach ($tweets as $tweet): ?>
           <div class="tweet">
             <div class="tweet-header">
-              <span class="username"><?php echo htmlspecialchars($tweet['username']); ?></span>
+              <span class="username">@<?php echo htmlspecialchars($tweet['username']); ?></span>
               <span class="timestamp"><?php echo date('Y/m/d H:i', strtotime($tweet['created_at'])); ?></span>
             </div>
             <div class="tweet-content">
diff --git a/public/workspace/php/twitter/index.php b/public/workspace/php/twitter/index.php
index a06f381..636f9d6 100644
--- a/public/workspace/php/twitter/index.php
+++ b/public/workspace/php/twitter/index.php
@@ -16,6 +16,7 @@
   <h1>つぶやき投稿</h1>
   
   <!-- TODO 2: 投稿フォームを作成する -->
+  <!-- ヒント: onsubmit="event.preventDefault(); alert('...');" でダミー動作を確認できます -->
   
   
   <hr>