What is the fine-grained topic of the following text: When BMW unveiled the 3.0 CSL Hommage Concept earlier this year, the world uttered a collective “Uh...” Fortunately, in time for the Pebble Beach Concours d’Elegance, BMW made it at least 30 percent less ugly the old fashioned way — with a race car livery. Only return the topic.
BMW 3.0 CSL Hommage Concept's race car livery unveiling at the Pebble Beach Concours d’Elegance.