Exclude CSS class form element in WordPress site

Solution:

You can useĀ removeClass();

 

$('.bookingbutton2').removeClass('wp-dark-mode-ignore');
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button type="button" class="bookingbutton2 wp-dark-mode-ignore" style="">
    <span>Reserve Now</span>
</button>