Please refer Faq's page in documentation itself for queries and customization like Colors, RTL, Dark style..etc.
The following HTML,JS, CSS you should have in your page to enable switcher.
Below HTML is in switcher.html file
<!-- custom-switcher js --> <script src="../assets/js/custom-switcher.js"></script> <!-- Switcher js --> <script src="../assets/switcher/js/switcher.js"></script>