.buttonizer-button::after {
    content: '';
    position: absolute;
    top: 5px;
    right: 5px;
    width: 12px;
    height: 12px;
    background: red;
    border-radius: 50%;
    animation: clignote 1s infinite;
}

@keyframes clignote {
    0% { opacity: 1; }
    50% { opacity: 0.2; }
    100% { opacity: 1; }
}