Sure! Here's a simple implementation of the classic game Tetris using HTML, CSS, and JavaScript:
To play the game, save the above code into a file with the ".html" extension (e.g., `tetris.html`), then open it in a web browser. Use the arrow keys (left, right, and down) to move the tetrominoes.
Please note that this is a simple implementation and does not include features like rotating pieces, scoring, or game over conditions. It's meant as a starting point for a basic Tetris game.