:target {
    animation: highlight 1s ease-in-out 4;
    background-color: rgba(253, 224, 71, .8);
}

@keyframes highlight {
    from {
        background-color: rgba(253, 224, 71, .8);
    }

    50% {
        background-color: rgba(253, 224, 71, .3);
    }

    to {
        background-color: rgba(253, 224, 71, .8);
    }
}