Add Dark Mode to Your Website

Add dark mode to your website using DarkReader. This is a simple way to add dark mode to your website.

• GitHub: https://github.com/darkreader/darkreader
• Add code below to _includes/head.html in your Jekyll project.

{% if jekyll.environment == 'production' -%}
  <!-- dark theme using DarkReader -->
  <script src="//unpkg.com/darkreader@4.9.40/darkreader.js"></script>
  <script type="text/javascript">
    DarkReader.setFetchMethod(window.fetch); // Fix to remedy CORS errors in chrome console
    //DarkReader.enable();
    DarkReader.auto( {brightness: 100, contrast: 90, sepia: 10} );
  </script>
  {%- endif %}

Reference:
reference the implementation from link