(function() {
  let els = document.getElementsByClassName('spin-transition');
  function updateSpin(el, val) {
    el.className = 'spin-transition spin-'+(val);
  }
  window.setInterval(() => {
    let date = Math.round((new Date().getTime()+200) / 1000); // +200ms for anim
    let seconds = (date+"").charAt((date+"").length-1);
    for(let i = 0; i < els.length; i++) {
      updateSpin(els[i], seconds);
    }
  }, 1000);
})();