I really need to write this up as there’s a lot going on in it but briefly – I like difference graph. I also like the mousemove function, which is responsible for the white line moving around. I also like that I finally learned how to format a tooltip using something called html which I need to find out more about. Could be big in the future.
A kind of line plus area graph, where the bottom line has no area, so the grey emphasises the gap
This is a horrible mix of responsive and non responsive, posted here as a warning to future generations.