If you want to use a CDN to reduce server load, using the Cloudflare is recommended.
The theme has been tested with a free account of Cloudflare and works correctly with the default settings.
If you are using the Jetpack plugin, do not turn on the Jetpack CDN option.
Theme background images are processed using the WebGL API. Unfortunately, due to security restrictions, images loaded from external CDNs are not available for processing in WebGL if the CDN service does not return the correct Access-Control-Allow-Origin header.
The theme is not work correctly with Jetpack CDN. Background images do not load correctly when the CDN option is enabled in the Jetpack plugin. The browser console displays the message: No 'Access-Control-Allow-Origin' header is present on the requested resource.