assets/css/src/icon.css

.icon-success {
    color: #468847
}

.icon-error {
    color: #b94a48
}

.icon-fade-out {
    opacity: 1;
    animation: icon-fadeout 5s linear forwards
}

@keyframes icon-fadeout {
    0% {
        opacity: 1
    }
    100% {
        opacity: 0
    }
}