There’s one IX2 that is onLoad and targetting a class that all the grid cells share, that is affecting their color, changing it from one to another to another… and repeat with a loop.
All those cells are divs.
Now there is an opacity IX2 on those divs, or rather on a div surrounding each of them (it’s better to not have several IX on the same element, so it’s better to nest). So those container divs are 0% opacity by defaut, and a onHover IX2 is probably making them 100% opacity and making this opacity fade to 0% in 3 seconds or so.
Oh, as the colored by is a gradient that takes up all the viewport, maybe it’s the other way around: the cells are white and the onHover IX makes them transparent for a few seconds.