codice HTML:
<!DOCTYPE html>
<html>
<head>
<style>
body {
    background-image: url("http://shrph.altervista.org/5/485465198.png");
    background-repeat:repeat;
}
</style>
</head>
<body>

<p>repeat-y will repeat a background image only vertically.</p>

</body>
</html>