Alternating Layouts within Collection Lists

Hi, I tried to embed the code from the ‘Alternating dynamic content’ post that you shared in the bottom container of my page, however I don’t think I did it correctly as when I publish nothing happens. My read only link is below and would welcome any insight into what i’m doing wrong. Many thanks.

https://preview.webflow.com/preview/michar-final-site-build?preview=a671e5864752fb13660e50065f1390a3