Click Header button – Open Book Now Resy Embed Lightbox

#1. First, you need to add your Book Now Resy embed code to the Code Injection – Footer.

It will appear at the bottom of the site, like this

#2. Use this code to Custom CSS box

span[aria-label*="Resy"] {
    display: none !important;
}

#3. Use this code to Code Injection – Footer, under your #1 code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).on('click', 'header#header a.btn', function(event) { 
    event.preventDefault(); 
    $('span[aria-label*="Resy"]').click(); 
});
</script>

#4. Result
When clicking the Header button > Book Now Resy Popup will appear