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<!DOCTYPE html>
<html><head>
<style>
#outer {
opacity: 0.8;
background-color:red;
width: 200px;
}
#inner {
opacity: 0.6;
background-color:white;
color:white;
}
</style>
</head>
<body>
<div id="outer">
<div style="width:200px; height:200px; background:black;"></div>
<div id="inner">
<div style="width:200px; height:200px; background:black;"></div>
<div style="width:200px; height:200px; background:rgb(50,50,50);"></div>
</div>
</div>
</body></html>