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<!doctype html>
<title>CSS Test Reference</title>
<meta charset="utf-8">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
html,
body {
height: 100%;
overflow: hidden;
margin: 0;
padding: 0;
background-color: #222;
}
body {
display: flex;
transform: scale(0.9);
}
#fixed {
position: fixed;
width: 100%;
height: 100%;
top: 0;
left: 0;
z-index: 1;
background: black;
}
#popup {
position: absolute;
width: 200px;
height: 200px;
left: 0;
top: 0;
z-index: 2;
background: green;
transform: scale( 1.1111 );
}
body, #popup {
transform-origin: 50% 50%;
}
</style>
<div id="popup"></div>
<div id="fixed"></div>