Form will not popup, when clicking on the link to the form

check this ..

replace YOUR.BUTTON.CLASS with Your Link Class

html body .show-important {
    display: block !important; // or flex
    opacity: 1 !important;
    filter: opacity(100%) !important;
}
html body .hide-important {
    display: none !important;
}
html body .hide-important * {
    display: none !important;
}
(function($){
    $(document).ready(function(){
        //when page loaded hide form
        $("#form_wrapper").hide(); // or $('#form_wrapper').removeClass("show-important").addClass("hide-important");
        $("YOUR.BUTTON.CLASS").on("click",function(){
            //if click the Button Show the Form
            $('#form_wrapper').show(); // or $('#form_wrapper').addClass("show-important").removeClass("hide-important");
        });
    });
})(jQuery)

if not worked , remove :

#form_wrapper {
  display:none;
}

and check again. any problem? type in comment plz.
i hope useful for you