Apologies, looking to fix it now! In the meantime the widget is visible on any blog post on my personal blog e.g. https://belev.me/2025/02/13/hexo-bluesky-feed-is-now-an-offi... - The demo page intends to also show the different themes and allow the user to switch between them. Will get it sorted asap.
This is now fixed, I forgot to change the visibility setting to public for the Gitlab Pages of the demo project, thank you for reporting it https://antonbelev.gitlab.io/beblob-demo/