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Test Info:

<!doctype html>
<title>CSS Test: Absolutely positioned children of flex container with CSS align</title>
<meta charset="utf-8">
<link rel="match" href="position-absolute-containing-block-002-ref.html">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
.parent {
position: fixed;
top: 0;
left: 0;
display: flex;
align-items: center;
justify-content: center;
width: 180px;
height: 180px;
/* Expand the background area to 200px, without touching the content-box,
which is what flex absolute children should be aligned relative to. */
border-top: 5px solid yellow;
padding-top: 15px;
border-left: 5px solid yellow;
padding-left: 15px;
background: yellow;
}
.child {
position: absolute;
width: 100px;
height: 100px;
background: green;
}
</style>
<div class="parent"><div class="child"></div></div>