.heartbeat:hover{animation:heartbeat 1.5s ease-in-out infinite both}@keyframes heartbeat{0%{transform:scale(1);transform-origin:center center;animation-timing-function:ease-out}10%{transform:scale(.91);animation-timing-function:ease-in}17%{transform:scale(.98);animation-timing-function:ease-out}33%{transform:scale(.87);animation-timing-function:ease-in}45%{transform:scale(1);animation-timing-function:ease-out}}