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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
#x {
width: 280px;
height: 280px;
background-image: repeating-linear-gradient(to bottom right, white, black, white 30px);
}
</style>
</head>
<body>
<div id="x"></div>
</body>
</html>