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<!DOCTYPE html>
<html>
<head>
<style>
.outer {
transform-style: preserve-3d;
width: 200px;
height: 200px;
opacity: 0.7;
}
.inner {
top: 50%;
transform: translateY(-50%);
background-color: green;
position:relative;
width: 200px;
height: 200px;
}
</style>
</head>
<body>
<div id="outer" class="outer">
<div class="inner">
</div>
</div>
</body>
</html>