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<!DOCTYPE html>
<title>CSS Reftest Reference</title>
<link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
<style>
div#black-walls
{
border: solid 40px;
border-color: transparent black;
height: 400px;
width: 400px;
}
div#gradient
{
background-image: linear-gradient(orange, blue);
height: 100%; /* computes to 400px */
margin: 0px auto;
/* the gradient block is horizontally centered inside div#black-walls */
width: 200px;
}
</style>
<div id="black-walls"><div id="gradient"></div></div>