How to blink some sentences like happy birthday to you

Answer 1

<span class="blink">happy birthday</span>
<style>
.blink {
-webkit-animation:blink 1s ease-in-out infinite;
animation:blink 1s ease-in-out infinite;
}
@-webkit-keyframes blink {
from { opacity:1; }
50% { opacity:0; }
to { opacity:1; }
}
@keyframes blink {
from { opacity:1; }
50% { opacity:0; }
to { opacity:1; }
}
</style>

Answer 2

thank you