Here's why:
* It's not a proper noun: "Continental breakfast" is a descriptive phrase referring to a type of breakfast, not a specific named entity.
* It's not a brand name: There is no specific brand or trademark associated with the term "Continental breakfast."
Examples:
* Correct: We were offered a continental breakfast at the hotel.
* Incorrect: We were offered a Continental Breakfast at the hotel.
Let me know if you have any other grammar questions!