jQuery Filtering

<!DOCTYPE html>
<html>
<head>
    <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
</head>
<body style="font-family: sans-serif; padding: 20px;">
    <p class="intro">Paragraf 0</p>
    <p class="intro">Paragraf 1</p>
    <p class="intro">Paragraf 2</p>
    <button id="btnFilter">Pilih Paragraf Pertama (first)</button>

    <script>
        $('#btnFilter').click(function() {
            $('p.intro').first().css('background-color', '#fca311');
        });
    </script>
</body>
</html>