You need to create an overlay section (fully customize).
And create a button with class
custom-button
In the code editor use JS code
Code example:
document.addEventListener('DOMContentLoaded', function(){
jQuery('.custom-button').on('click', function(event){
event.preventDefault();
jQuery('.custom-overlay').trigger('click');
})
});
Replace
custom-overlay with the path to the button that opens overlay section.
Best Regards,
Vyacheslav, Balbooa Support Team