@Tessa_learner1
Please check if the style is applied on the template level or page level as
- you can define style classes in the content policy of components.
- you can then select these classes from a drop-down when editing the component on a page.
Also, why do you want to use form field in forms? You can either embed the complete adaptive itself (with the styling) OR use the page components equivalent of form fields for the purpose.
Not sure of the Forbidden error that you're seeing on the console, you may want to check the Authentication support service config of this instance.