一個div相對另一個div相對浮動,且改變窗口大小之後,浮動的位置不變

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>Title</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style type="text/css">
        #back{

            background:url(background/${gameinformation.gid}.gif);
            background-repeat:no-repeat;
            background-position:center;
            background-attachment:fixed;
            width: 100%;
            height: 100%;
            background-size:100% 100%;

        }
        #seal{
            background-image:url(seal/${gameinformation.gid}.gif);
            background-repeat:no-repeat;
            width: 30%;
            height: 30%;
            position: relative;
            top: 60%;
            left: 65%;
            background-size:80% 90%;

        }
    </style>
</head>
<body   >
<div id="back">
    <div id="seal">

    </div>
</div>

</body>
</html>
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