How to (FAQs) How to apply custom CSS code. Estimated reading: 1 minute 99 views Contributors You can apply your own custom CSS code on Charles theme. Your custom CSS code will not be lost even if you update the theme. Navigate to Appearance > Customize > Additional CSS Take a look at the screenshots- How to apply custom CSS code. - Previous Updating Your Theme Next - How to apply custom CSS code. How to Paginate a Post ?