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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
div {
display: inline-block;
margin: 10px;
border: 1px solid black;
padding: 5px;
width: 90px;
height: 90px;
}
span {
display: block;
width: 70px;
height: 70px;
background-color: lime;
border: 10px solid grey;
}
</style>
<div><span></span></div>
<div><span></span></div>
<div><span></span></div>
<div><span></span></div>