window.animateCSS = function(element, animationName, callback) {
  element.classList.add('animated', animationName)
  function handleAnimationEnd() {
    element.classList.remove('animated', animationName)
    element.removeEventListener('animationend', handleAnimationEnd)
      if (typeof callback === 'function') callback()
  }
  element.addEventListener('animationend', handleAnimationEnd)
}