in assets/js/backToTop.js [13:26]
$(window).scroll(function(){
if ($(this).scrollTop() > offset) {
$backToTop.fadeIn();
$shareNav.fadeIn();
} else {
$backToTop.fadeOut();
$backToTop.removeClass('btt-fade-out');
$shareNav.fadeOut();
}
if($(this).scrollTop() > offset_opacity) {
$backToTop.addClass('btt-fade-out');
}
});