css分层,实现遮罩底层弹出新窗口里可以操作，最下层能看到单不能操作

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body><div style="background-color: #00A770;height: 5000px">123</div>
<div style="background-color: black;z-index: 9;position: fixed;
top: 0;
bottom: 0;
left: 0;
right: 0;
opacity: 0.5;
"></div><div style="background-color: white;height: 200px;width:400px;z-index: 10;
position: fixed;top: 50%;left: 50%;margin-top: -100px;margin-left: -200px">
<input type="text">
<input type="text"></div></body>
</html>