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<!DOCTYPE html>
<style>
body { background-color: white; }
#outer
{
width: 100px; height: 100px;
padding: 1px;
background-color: black;
}
#inner
{
width: 100px; height:100px;
background-color: white;
}
</style>
</head>
<body>
<div id="outer"><div id="inner"></div></div>
</body>
</html>