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<!doctype html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
.container {
border: 1px solid green;
width: 100px;
height: 100px;
margin-top: 100px;
display: flex;
position: relative;
}
.abspos {
position: absolute;
top: 0;
left: 0;
background: orange;
height: 20px;
width: 20px;
}
</style>
<div class="container">
<div class="abspos"></div>
</div>