[Ur] Signature for a style declaration

[Sergey Mironov]

Me again.
I want to export some styles from my module. What signatures should I
write in the *urs file in order to do it? For example, bootstrap
library exports styles but it doesn't contain urs file (Ur/Web
generates it silently AFAIK). But in my case it is my responsibility
so how should I handle it?

Placing

(* Module.urs *)
val mystyle : css_class

(* Module.ur *)
style mystyle

doesn't work :(


Regards,
Sergey