.hello-button{color:#fff;cursor:pointer;background-color:#0070f3;border:none;border-radius:5px;padding:10px 20px;transition:transform .2s ease-in-out}.hello-button.animate{animation:.5s ease-in-out pulse}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}