div#slider {
    display: block;
    width: 20%;
    margin: auto;
    max-width: 1000px;
    overflow: hidden ;
    padding-top: 2.5%;
    padding-bottom: 2.5%;
}

div#slider figure {
    position: relative;
    width: 500%;
    margin: 0;
    padding: 0;
    font-size: 0;
    left: 0;
    text-align: left;
    animation: 30s slidy infinite;
    display: flex;
    flex-wrap: wrap;
}

div#slider figure img {
    width: 20%;
    float: left;
    align-self: center;
}



@keyframes slidy {
    0% {
        left: 0%;
    }

    20% {
        left: 0%;
    }

    25% {
        left: -100%;
    }

    45% {
        left: -100%;
    }

    50% {
        left: -200%;
    }

    70% {
        left: -200%;
    }

    75% {
        left: -300%;
    }

    95% {
        left: -300%;
    }

    100% {
        left: -400%;
    }
}