Ursina CSS extends your game possibilities by allowing your game to run in the user's browser, to extend game compatibilty.

When creating your game add the ursina and the Brython-<version> folders and the .nojekyll, index.html and start_server.bat files in your root directory. You can then simply code your game as a standard game and then open start_server.bat (Windows) or open your terminal, navigate to your game directory and run python3 -m http.server <port>. If you do not specify the port, it will be by default 8000. You then just need to open your browser to localhost:<port> and enjoy.