uses CSS to select only markers on the results map, so the style element doesn't have to be removed/reinserted for every round.
This allows us to remove the pre-round-results event and lets us decouple the Game class from the window (this is also good for writing tests for it in the future).
uses a separate CSS rule on the post-game results screen so you can still see the locations on the map.
Two small enhancements:
pre-round-resultsevent and lets us decouple the Game class from the window (this is also good for writing tests for it in the future).