How do you apply CSS to individual fields in the new modern designer?  We found CSS in the themes section but when we apply the same CSS we had in the older designer it doesn't do anything.   Are we missing something, is there any documentation about this to show the new field are identified and how to have form-specific CSS as opposed to theme-specific css.  

Also, when a form is converted it puts the CSS classes on the fields but I can't find those classes anywhere, and when we add them to the CSS area of themes still nothing happens. 

Here is an example of a CSS piece that worked on an old form but not on the new "modern" forms.

#form-title-wrap {text-align: right;}