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<meta charset="utf-8">
<title>Reference: margin:auto on grid abs.pos. child</title>
<link rel="author" title="Mats Palmgren" href="">
<style type="text/css">
div {
display: block;
position: relative;
grid-template-columns: 100px;
grid-template-rows: 100px;
width: 100px;
height: 100px;
border: 1px solid;
span {
display: block;
position: absolute;
background: lime;
width: 20px;
height: 20px;
margin: 5px 7px 11px 13px;
top:0; left:0; right:0; bottom:0;
<div><span style="margin-left:auto"></span></div>
<div><span style="margin-right:auto"></span></div>
<div><span style="margin-left:auto; margin-right:auto"></span></div>
<div><span style="margin-top:auto"></span></div>
<div><span style="margin-bottom:auto"></span></div>
<div><span style="margin-top:auto; margin-bottom:auto"></span></div>
<div><span style="margin:auto"></span></div>