let amountScrolled = 100;
$(".page__wrapper").scroll(function() {
if ( $(".page__wrapper").scrollTop() > amountScrolled ) {
$('.arrow-up').fadeIn('slow');
} else {
$('.arrow-up').fadeOut('slow');
}
});
$('.arrow-up').on('click', function() {
// alert(111);
$('.page__wrapper').animate({
scrollTop: 0
}, 700);
return false;
});