Style a field as required

[micheldf]

Hi, in the Diamond template there is a CRUD, when we click on the button it validates which fields are required, it is working fine.

But if I need the user to know which fields are required before que clicks on the button, how can I achieve it please ?

Maybe there is a style somewhere I can just use. The idea is that it doesn't look like an error, but just an indication that that field is required.