body { margin: 0;}
#center {
    font-family: 'Comic Sans MS';
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
@keyframes bounce {
    0%, 50%, 100% { transform: scale(1); }
    30% { transform: scale(1.4) }
    70% { transform: scale(1.2); }
}
.bounce { animation: bounce 0.5s;}