JSFiddle - React, Tailwind, and code Playground

by Alex Alexandrov

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js"></script>
<div class="block">
  <div class="link">selection</div>
</div>

CSS

.black {background: #222;color: #FFF;}

JavaScript

var status = $.cookie('blockColor');
status && $(".block").addClass(status);

$(".link").click(function(e){
  $(".block").addClass('black');
  $.cookie('blockColor', 'black', { expires: 7, path: '/' });
  
});