No.
"the [draw] offer cannot be withdrawn and remains valid until the opponent accepts it, rejects it orally, rejects it by touching a piece with the intention of moving or capturing it, or the game is concluded in some other way."
Article 9.1b FIDE Laws of Chess
I'd forgotten that once I'd made a move in the Online Chess section I was automatically sent to the next game. This is an option that I normally enjoy. However, I'd meant to send a draw offer to the player of the game I'd just submitted a move for, and accidentally sent it to the next game - a game I should win. Is there a way to withdraw a draw offer? Thanks.