All the boxes are green, apart from the key which is bright blue, bright yellow, dark yellow, orange, red, and maroon.

Thanks, I got a bit worried :)

To be honest, if the boxes were smaller, I couldn't definitively say as I'm also red-green color blind. So I'm glad someone could clear it up for us.

One great example of the case where I absolutely cannot tell is when you have a LOT of tests in something like buildkite https://buildkite.com/features and most API status pages (many small green/yello/red circles/boxes).