@keyframes pulse {

    0% {
    opacity: 0.7;
    transform: scale(0.9);
    }

    50% {
    opacity: 1;
    transform: scale(1);
    }

    100% {
    opacity: 0.7;
    transform: scale(0.9);
    }

}

.pulse {
animation-duration: 1.5s;
animation-iteration-count: 3;
animation-name: pulse;
}