.badge {
    display: inline-block;
    background-color: #f66;
    border-radius: 50%;
    color: #fff;
    padding: 0.5em 0.75em;
    position: relative;

}
.pulsate::before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    animation: pulse 1s ease infinite;
    border-radius: 50%;
    border: 8px double rgb(255, 0, 0);
}
@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
   }
    60% {
        transform: scale(2);
        opacity: 0.4;
   }
    100% {
        transform: scale(3);
        opacity: 0;
   }
}