CSS: How to say .class:last-of-type [classes, not elements!] [duplicate]
Unfortunately finding the last .class is not possible with last-of-type.
Edit:
To actually add something constructive to this answer, you could fallback to JavaScript to locate this selector, or revise your markup/CSS. Whilst I have found myself in the situation that last-of-type for a class selector would be useful, it's nothing that cannot be worked around with a little more thought.