Hi David,

Jelly tags are processed on the server side and transformed into html tags that can be interpreted by any client (browser). You may want to try to create the styles aligned to the resultant html code that is created. You can take a look to this resultant code created by opening your UI page on your browser using "Inspect".

Additionally, I'll recommend you add your style tags at the beginning of your ui page code after the default ui page header tags.

I hope this helps.

Thanks,

Berny