#toast_red_error {
    opacity: 0;
    visibility: hidden;
    position: absolute;
    width: 100%;
    bottom: auto;
}

#toast_red_error.show {
    visibility: visible;
    animation: fade-out 2000ms;
}

@keyframes fade-out {
    0% { opacity: 1; }
    50% { opacity: 1; }
    100% { opacity: 0; }
}