Animations

<div>
    <script>
        function onFadeInClick() {
            var fadeInElement = document.querySelector('#fadeIn');
            fadeInElement.className = 'fade-in'; 
            setTimeout(function() {fadeInElement.className = ''}, 1000);
        }
    </script>
    <div class="margin-bottom-medium">
        <input type="button" value="Show" onclick="onFadeInClick();" />
    </div>
    <div id="fadeIn" class="">
        Lorem ipsum dolor sit amet.
    </div>
</div>