@keyframes rgb-button {
    0% { color: #ff0000; border-color: #ff0000; }
    33% { color: #00ff00; border-color: #00ff00; }
    66% { color: #0000ff; border-color: #0000ff; }
    100% { color: #ff0000; border-color: #ff0000; }
}

.rgb-effect {
    animation: rgb-button 3s linear infinite;
}