Answers for "css animation one time"

css animation infinite loop

div {
  animation-iteration-count: number|infinite|initial|inherit;
}

css animation once

a:hover {
        animation: hover 200s infinite alternate ease-in-out;
    }

@keyframes hover {
    0% {
        transform: scale(1, 1);
    }
    1% {
        transform: scale(1.1, 1.1);
    }
    100% {
        transform: scale(1.1, 1.1);
    }
}