jQuery css()

<!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;">
    <h3 id="judulCss">Kustomisasi CSS Instan</h3>
    <button id="btnUbahCss">Ubah Gaya CSS</button>

    <script>
        $('#btnUbahCss').click(function() {
            $('#judulCss').css({
                'color': '#00758f',
                'font-size': '28px',
                'border-bottom': '2px solid #00758f'
            });
        });
    </script>
</body>
</html>