blink {
  animation: blink 1s infinite;
  color: yellow;
  background-color: red;
  font-family: Comic Sans MS, Comic Sans, cursive;
}
@keyframes blink {
  0% { opacity: 0; }
  50% { opacity: 0; }
  51% { opacity: 1; }
  100% { opacity: 1; }
}