oh then this might be a bug. If you hover the bottom right diagram, you should be able to see a dark red line in the left one. Can you try to place the cursor onto one of the dark regions and confirm that you don't see such a line in the left plot? It should look like in the screenshot (my screenshot tool doesn't capture the cursor so I drew it in manually). I'm pretty new to web dev so there might be some browser compatibility issues... Thanks in advance.