1. Setup and preview the overlays below. If you do not enter any values, defaults will be used.
2. When you're happy with the preview, copy & paste the URL of the overlay into OBS' Browser-Source.
3. Remove all code from the CSS field of the Browser-Source. Olay will load its own styles for each overlay.
4. Optionally, copy & paste the parts of the default CSS (displayed for each module below) you want to override into the CSS field of the Browser-Source and start adjusting it to your liking. Advanced users can also do this in the developer console of the webbrowser (navigate to the Style Editor-Tab and select style.css) - this has the benefit of providing a realtime preview of your changes.

Feel free to post your questions/feedback/ideas in either the GitHub or OBS forums if you need more help with, or have specific questions about, Olay.
For help with CSS, please see CSS for starters.