JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bg">
    <div class="cd-member-bio member-1">
        <a data-type="gall-1"><div  class="proektimg" id="p1"></div>link1</a>
    </div>
    <div class="cd-member-bio member-2">
        <a data-type="gall-2"><div  class="proektimg" id="p2"></div>link2</a>
    </div>
</div>
<div id="bg2">
    <div class="gallery gall-2"></div>
</div>

JavaScript

$('#bg').find('a').on('click', function(event){
    event.preventDefault();
    var selected_gall = $(this).data('type');
    $('.gallery.'+selected_gall).addClass('slide-in');
    $('#fonbg').addClass('one');
});