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index.html
​x
 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <style>
        input:invalid {
            background-color: lightpink;
        }
​
        input:valid {
            background-color: lightgreen;
        }
    </style>
</head>
<body>
    <form>
        <label>Enter a number (1-10):</label>
        <input type="number" min="1" max="10" required>
    </form>
</body>
</html>