@keyframes rainbow {
0% { color: #ff0000; }
16.66% { color: #ff8000; }
33.33% { color: #ffff00; }
50% { color: #00ff00; }
66.66% { color: #0000ff; }
83.33% { color: #8000ff; }
100% { color: #ff0000; }
}