<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title></title>
  <style>
    body {
      margin: 0;
      padding: 0;
      font-family: "Helvetica Neue", sans-serif;
      background-color: #f0f2f5;
      color: #333;
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
      flex-direction: column;
      text-align: center;
    }
    .container {
      padding: 20px;
    }
    h1 {
      font-size: 2.5em;
      margin-bottom: 0.5em;
    }
    p {
      font-size: 1.2em;
      color: #666;
    }
    .spinner {
      margin-top: 30px;
      width: 40px;
      height: 40px;
      border: 5px solid #ccc;
      border-top: 5px solid #007bff;
      border-radius: 50%;
      animation: spin 1s linear infinite;
      display: inline-block;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }
    footer {
      position: absolute;
      bottom: 10px;
      font-size: 0.9em;
      color: #aaa;
    }
  </style>
</head>
<body>
<div class="spinner"></div>
</body>
</html>