$(window).scroll(function (){
$('.fadein').each(function(){
var elemPos = $(this).offset().top,
scroll = $(window).scrollTop(),
windowHeight = $(window).height();
if (scroll > elemPos - windowHeight + 100){
$(this).addClass('scrollin');
}
});
});
$(window).scroll();
.fadein {
opacity : 0;
transform : translate(0, 50px);
transition:all 0.8s;
display:block;
margin:60px auto;
text-align:center;
}
.fadein.scrollin {
opacity : 1;
transform : translate(0, 0);
}