pop animation

.pop {
    animation: pop 0.58s infinite;
    -webkit-animation: pop 0.58s infinite;
}
@keyframes pop {
    from {
        transform:scale(0.90)
    }
    50% {
        transform:scale(1.01)
    }
    to {
        transform:scale(0.90)
    }
}
@-webkit-keyframes pop {
    from {
        -webkit-transform:scale(0.90)
    }
    50% {
        -webkit-transform:scale(1.01)
    }
    to {
        -webkit-transform:scale(0.90)
    }
}