Animation:

@keyframes RainbowName{
	from {
    -webkit-filter:hue-rotate(15deg);
            filter:hue-rotate(15deg);
    }
  to {
    -webkit-filter:hue-rotate(360deg);
            filter:hue-rotate(360deg);
    }
}
a[href*=REPLACE THIS WITH YOUR NAME] {
     animation: RainbowName 3s infinite;
}

For example

I already did it

Cool