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<!doctype html>
<title>CSS Test Reference</title>
<style>
body {
font-size: 30px;
}
.container {
font-size: 5px;
height: 40px;
}
.container::after {
content: "";
display: block;
border: 2px solid blue;
width: 1em;
height: 1em;
font-size: 1em;
}
</style>
<div class="container"></div>
<div class="container"></div>
<div class="container"></div>
<div class="container"></div>
<div class="container"></div>