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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Flexbox Test Reference File</title>
<style>
div {
background-color: green;
height: 25px;
width: 100px;
}
</style>
<body>
<p>Test passes if there is a filled green square and no red, the number within square is '1 2 3 4' from top to bottom.</p>
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</body>