.element-dance {
    animation: dance 1.5s ease-in-out infinite;
    display: inline-block; /* prevent weird text wrapping */
}

@keyframes dance {
    0%   { transform: scale(1) rotate(0deg); }
    25%  { transform: scale(1.1) rotate(10deg); }
    50%  { transform: scale(1) rotate(0deg); }
    75%  { transform: scale(1.1) rotate(-10deg); }
    100% { transform: scale(1) rotate(0deg); }
}