If both digits are the same you could write just one, for example, #000000 for #000
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en'>
<head>
<title>background-color</title>
<style rel='stylesheet' type='text/css'>
body {
background-color: yellow;
}
div#one {
width: 50px;
height: 50px;
border: 1px solid rgb(128, 128, 128);
margin: 5px;
float: left;
background-color: #000;
}
</style>
</head>
<body>
<div id='one'></div>
</body>
</html>
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