Hi Darren,
Try clearing the cache of your browser on your Azure AVD (it seems like there is a cache issue with the CSS not being updated in the browser).
If there is an external DNS such as Cloudflare, you may want to clear the cache of the website there as well.
(Example of Purging Cache in Cloudflare)
https://developers.cloudflare.com/cache/how-to/purge-cache/
If this is helpful please accept answer.