footer {
    margin: 0.5em;
}

.auth_ok {
    color: green;
}
.auth_expired {
    color: red;
    animation: blinker 1s linear infinite;
}

.warn_message {
    color: red;
    animation: blinker 2s linear infinite;
}

@keyframes blinker {
    50% {
        opacity: 0;
    }
}