当使用php和mysql从数据库列出信息时,你会如何使第一行看起来与其他行不同？

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
  die("连接失败: " . $conn->connect_error);
}

// 查询数据
$sql = "SELECT id, name, email FROM MyGuests";
$result = $conn->query($sql);

$data = array();
if ($result->num_rows > 0) {
  // 输出数据
  while($row = $result->fetch_assoc()) {
    $data[] = $row;
  }
} else {
  echo "0 结果";
}
$conn->close();
?>

 <thead>
    <tr>
      <th>ID</th>
      <th>Name</th>
      <th>Email</th>
    </tr>
  </thead>
 <tbody>
    <?php foreach ($data as $row) { ?>
      <tr>
        <td><?php echo $row['id']; ?></td>
        <td><?php echo $row['name']; ?></td>
        <td><?php echo $row['email']; ?></td>
      </tr>
    <?php } ?>
  </tbody>
</table>

table tbody tr:first-child {
  background-color: #f2f2f2;
  font-weight: bold;
}