<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body{
background-color: #ccc;
}
div:first-of-type{
width: 300px;
height: 300px;
background: repeating-radial-gradient(circle closest-side at center center,
#fff 0%,#fff 10%,
#000 10%,#000 20%);
}
div:last-of-type{
width: 200px;
height: 800px;
background: repeating-linear-gradient(45deg,
#fff 0%,#fff 10%,
#000 10%,#000 20%);
}
</style>
</head>
<body>
<div></div>
<div></div>
</body>
</html>
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