This example shows how to use the url-gen JS SDK to apply an effect on an image to be able to show the image when dark theme is used

Working example https://stackblitz.com/edit/vitejs-vite-cpcpdb?file=src%2Findex.css

To run this example add the following to your .env file

VITE_CLOUD_NAME=<YOUR_CLOUD_NAME>
VITE_PUBLIC_ID=<THE_IMAGE_ID_ON_YOUR_MEDIA_LIBRARY>