.blink-rainbow{
  font-weight: bold;
  padding-left:20px;
  padding-right:20px;
  animation:rainbow 4s linear infinite;}
@keyframes rainbow{
  0% {background: Red; color:#fff;}
  /*25% {background: Gold; color:#fff;}*/
  50% {background: DarkViolet; color:fff;}
  /*75% {background: RoyalBlue; color:#eee;}*/
  /*100% {background: DarkViolet; color:#eee;}*/
}