CSS绝对定位模拟固定定位

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            *{
                margin: 0;
                padding: 0;
            }
            html,body{
                height: 100%;
                overflow: hidden;
            }
            #wrap{
                height: 100%;
                border: 1px solid deeppink;
                overflow: auto;
            }
            #pink{
                position: absolute;
                left: 0;
                top: 0;
                width: 200px;
                height: 200px;
                background: pink;
            }
        </style>
    </head>
    <body>
        <div >
            <div ></div>
            <div ></div>
        </div>
    </body>
</html>

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