HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS number:valid</title>
  <style>
    input[type="number"]:valid {
      border: 2px solid #15803d;
    }

    input[type="number"]:invalid {
      border: 2px solid #b91c1c;
    }
  </style>
</head>
<body>
  <label>
    Age (18–60)
    <input type="number" min="18" max="60" required value="25">
  </label>
</body>
</html>

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CSS :valid - Number Range