@keyframes pulsate {
    0%, 100% {
        transform: scale(0);
        -webkit-transform: scale(0);
    }
    50% {
        transform: scale(1);
        -webkit-transform: scale(1);
    }
}

.pulsate {
    width: 100%;
    height: 100%;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    opacity: .6;
    position: absolute;
    top: 0;
    left: 0;
    -webkit-animation: pulsate 2s infinite ease-in-out;
    animation: pulsate 2s infinite ease-in-out;
}

.pulsate-dark {
    background-color: #333;
}

.pulsate-light {
    background-color: #f3f3f3;
    -webkit-animation-delay: -.7s;
    animation-delay: -.7s;
}