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<!DOCTYPE html>
<html>
<style>
body {
margin: 0;
}
.parent {
margin-top: 100px;
margin-left: 25%;
height: 200px;
outline: 4px solid black;
}
.abspos {
position: absolute;
width: 200px;
height: 200px;
background-color: green;
}
</style>
<body>
<div class="parent">
<div class="abspos"></div>
</div>
</body>
</html>