Дмитрий Пыркин

body{
background:url(img.png) no-repeat center;
background-size:cover
}

window.onmousewheel = function(){
    var delta = e.deltaY || e.detail || e.wheelDelta;
    if(delta>0){
        console.log('down')
    }
    else if(delta<0){
        console.log('up')
    }
    
    }