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<!doctype html>
<meta charset=utf-8>
<style>
.hr {
color: gray;
border-style: inset;
border-width: 1px;
margin: 0.5em auto;
}
.green {
color: green;
}
.no-inset {
border-style: solid;
}
</style>
<div class='hr'></div>
<div class='hr no-inset'></div>
<div class='hr no-inset'></div>
<div class='hr green no-inset'></div>