div css博客模板

/* 默认样式 */
div {
  width: 100%;
}

/* 当屏幕宽度大于 768px 时应用的样式 */
@media (min-width: 768px) {
  div {
    width: 50%;
  }
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>博客模板</title>
  <style>
    body {
      font-family: Arial, sans-serif;
    }
    .container {
      width: 80%;
      margin: 0 auto;
    }
    .header {
      background-color: #f1f1f1;
      padding: 20px;
      text-align: center;
    }
    .content {
      padding: 20px;
    }
    @media (min-width: 768px) {
      .container {
        width: 60%;
      }
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="header">
      <h1>我的博客</h1>
    </div>
    <div class="content">
      <p>欢迎来到我的博客！</p>
    </div>
  </div>
</body>
</html>