Sure, here's an example of a simple Atari Pong game implemented using HTML, CSS, and JavaScript as a single HTML file:
In this implementation, the game features a player-controlled paddle on the left side of the screen, and an AI-controlled paddle on the right side. The goal is to hit the ball with the paddle and prevent it from crossing the player's side. The game ends if the ball crosses the player's side, and it will reset to the starting position.
Note: This is a basic implementation of Atari Pong and can be further enhanced with additional features, such as keeping score, adding levels, etc.