add unique id to the whole form

Hi,... can I add unique id to the whole form?

It is to be able to reference it in the CSS that you make and thus only affect a specific form

I am not sure this is what you are looking for but it is possible to add an ID that automatically increments each time the form is submitted using a unique ID widget:

https://widgets.jotform.com/widget/autoincrement

I am not sure what you mean by applying that unique ID to a whole form and allowing for CSS to only apply to a single form.  CSS can be edited on a per form basis.  Any changes made to styling will only apply to that specific form.