.button:hover span{animation:shake-letters .8s ease both;display:inline-block}@keyframes shake-letters{0%,to{transform:translateY(0)}20%{transform:translateY(-2px) rotate(1deg)}40%{transform:translateY(1px) rotate(-1deg)}60%{transform:translateY(-1px) rotate(.5deg)}80%{transform:translateY(.5px) rotate(-.5deg)}}