Template:AnimatedRainbowGlow/rainbowglow.css

@keyframes rainbowglow{
   0%{text-shadow: 0 0 10px red;}
   16%{text-shadow: 0 0 10px orange;}
   32%{text-shadow: 0 0 10px yellow;}
   48%{text-shadow: 0 0 10px lime;}
   64%{text-shadow: 0 0 10px cyan;}
   80%{text-shadow: 0 0 10px blue;}
   90%{text-shadow: 0 0 10px #FF00FF;}
   100%{text-shadow: 0 0 10px red;}
}

.rainbowglow {
        animation: 2s rainbowglow
infinite;
}