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ID selector
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CSS Selectors</title>
<style>
{
height: 30px;
width: 50%;
border-style: solid;
border-width: 10px;
border-image: radial-gradient(circle, red, orange, yellow) 1;
}
</style>
</head>
<body>
<h1>My pets</h1>
<p>Cat</p>
<p id="border">Сanary</p>
<p>Dog</p>
</body>
</html>
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