<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
.parent{
width: 400px;
height: 400px;
border:1px solid gray;
position: relative;
}
.child{
width: 100px;
height: 100px;
top:0;
left:0;
right:0;
bottom:0;
margin:auto;
background: pink;
position: absolute;
}
</style>
</head>
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
</html>
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