CSS

blink css

.blink {
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

css blink animation

.blink {
  animation: blink-animation 1s steps(5, start) infinite;
  -webkit-animation: blink-animation 1s steps(5, start) infinite;
}
@keyframes blink-animation {
  to {
    visibility: hidden;
  }
}
@-webkit-keyframes blink-animation {
  to {
    visibility: hidden;
  }
}