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<!DOCTYPE html>
<style>
body {
margin: 0;
overflow: hidden;
}
.opacity {
opacity: 0.8;
}
.box {
left: 0;
top: 200px;
width: 200px;
height: 200px;
}
.absolute {
position: absolute;
background: green;
top: 100px;
}
.fixed {
position: absolute;
background: blue;
}
</style>
<div class="opacity">
<div class="box absolute"></div>
<div class="box fixed"></div>
</div>