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console 命令行工具 X clear 

                    

                        
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console

            
<p>A</p>
<p>BBB</p>
<p>CCCCCC</p>
<p>A</p>
<p>BBB</p>
<p>CCCCCC</p>
<p>A</p>
<p>BBB</p>
<p>CCCCCC</p>
<p>A</p>
<p>BBB</p>
<p>CCCCCC</p>
<p>A</p>
<p>BBB</p>
<p>CCCCCC</p>

            
body{
    padding: 10px;
    border: 10px solid rgba(10,10,10,.2);
    background-color: yellowgreen;
    background-image:url(https://www.w3school.com.cn/i/eg_bg_03.gif);
    background-repeat: no-repeat;

    /* 默认scroll 随内容滚动 */
    /* background-attachment: scroll; */
    background-attachment: fixed;
}