高级的背景例子

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>php中文网(php.cn)</title> 
<style>
body
{
    margin-left:200px;
    background:#5d9ab2 url('https://img.php.cn/upload/article/000/000/015/5c6ba8b3a7ee3101.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">
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