I added CSS to rotate the Interactive Diagram -45 degrees to match the original diagram. I then modified /cgi-bin/fen2.php to remove the extension of p (for piece) when t (for theme) has a non-empty value so that it can more easily be used with Interactive Diagrams, and I used this to rotate each piece 45 degrees. This counters the -45 degree rotation of the board, making them all appear upright.
I added CSS to rotate the Interactive Diagram -45 degrees to match the original diagram. I then modified /cgi-bin/fen2.php to remove the extension of p (for piece) when t (for theme) has a non-empty value so that it can more easily be used with Interactive Diagrams, and I used this to rotate each piece 45 degrees. This counters the -45 degree rotation of the board, making them all appear upright.