.pulse{
    animation-name: pulse;
    -webkit-animation-name: pulse;

    animation-duration: 1.5s;
    -webkit-animation-duration: 1.5s;

    animation-iteration-count: 1;
    -webkit-animation-iteration-count: 1;
}

@keyframes pulse {
    0% {
        transform: scale(1.0);
        opacity: 1;
    }
    50% {
        transform: scale(0.9);
        opacity: 0.7;
    }
    100% {
        transform: scale(1.0);
        opacity: 1;
    }
}

@-webkit-keyframes pulse {
    0% {
        -webkit-transform: scale(1);
        opacity: 1;
    }
    50% {
        -webkit-transform: scale(0.95);
        opacity: 0.7;
    }
    100% {
        -webkit-transform: scale(1);
        opacity: 1;
    }
}