index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>邮件标题</title>
  <style>
    /* 添加样式 */
    body {
      font-family: Arial, sans-serif;
      background-color: #F5F5F5;
      padding: 20px;
    }
    .container {
      max-width: 800px;
      margin: 0 auto;
      background-color: #FFFFFF;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    }
    h1 {
      font-size: 24px;
      color: #333333;
    }
    p {
      font-size: 16px;
      color: #666666;
      line-height: 1.5em;
    }
    a {
      color: #0088CC;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <!-- 邮件内容 -->
  <div class="container">
    <h1>邮件标题</h1>
    <p>你好，</p>
    <p>这里是邮件内容。</p>
    <p>请注意查收。</p>
    <br>
    <p>谢谢！</p>
  </div>
</body>
</html>