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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="utf-8">
<style>
body, html {
width: 100%;
height: 100%;
}
.front {
position: fixed;
width: 300px;
height: 300px;
top: 0;
left: 0;
background: red;
opacity: 0.5;
color: white;
}
.back {
position: absolute;
width: 200px;
height: 200px;
top: 50px;
left: 50px;
background: blue;
opacity: 0.5;
color: white;
display: none;
}
</style>
</head>
<body>
<div class="back">back</div>
<div class="front">front</div>
<p>Hello world</p>
</body>
</html>
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