Event when you scroll the page?

Trying to do the same effect as in the video:
https://youtu.be/bNVU82qP1n4?t=4m24s (4.24 min)
need so that when you scroll the wheel down to change the page
July 9th 19 at 13:11
2 answers
July 9th 19 at 13:13
document.onmousewheel = function(){/*your code*/}
July 9th 19 at 13:15

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