#test {
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
}

#test img {
    max-width: 100%;
    animation: none 2s linear forwards;
}

@keyframes img-in {
    0% {
        filter: grayscale(100%);
        opacity: 0;
        transform: scale(1.05);
    }

    50% {
        filter: grayscale(100%);
        opacity: 1;
        transform: scale(1);
    }

    100% {
        filter: grayscale(0);
    }
}

@keyframes img-out {
    0% {
        filter: grayscale(0);
        opacity: 1;
        transform: scale(1);
    }

    30% {
        filter: grayscale(100%);
    }

    100% {
        filter: grayscale(100%);
        opacity: 0;
        transform: scale(1.05);
    }
}