Check https://codepen.io/bramus/pen/vKpjNP jQuery(function ($) { // Function which adds the 'animated' class to any '.animatable' in view var doAnimations = function () { // Calc current offset and get all animatables var offset = $(window).scrollTop() + $(window).height(), $animatables = $('.animatable'); // Unbind scroll handler if we have no animatables if ($animatables.length == 0) { $(window).off('scroll', doAnimations); } // Check all animatables and animate them if necessary $animatables.each(function (i) { var $animatable = $(this); if ($animatable.offset().top + $animatable.height() - 20 < offset) { $animatable.removeClass('animatable').addClass('animated'); } }); }; // Hook doAnimations on scroll, and trigger a scroll $(window).on('scroll', doAnimations); $(window).trigger('scroll'); }); //# sourceURL=pen.js -->