高级的背景例子 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    body {
      margin-left: 200px;
      background: #5d9ab2 url("/examples/img_tree.png") no-repeat top left;
    }

    .container {
      text-align: center;
    }

    .center_div {
      border: 1px solid gray;
      margin-left: auto;
      margin-right: auto;
      width: 90%;
      background-color: #d0f0f6;
      text-align: left;
      padding: 8px;
    }
  </style>
</head>

<body>
  <div class="container">
    <div class="center_div">
      <h1>Hello World!</h1>
      <p>This example contains some advanced CSS methods you may not have learned yet. But, we will explain these methods in a later chapter in the tutorial.</p>
    </div>
  </div>
</body>
</html>
        