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<!DOCTYPE html>
<style>
.container {
position: relative;
width: 100px;
height: 100px;
background: red;
}
.abs {
width: 100px;
height: auto;
background: green;
position: absolute;
inset: 0;
margin: auto;
}
</style>
<div class="container">
<div class="abs"></div>
</div>