#slider{
    overflow: hidden;
}
#slider figure {
    position: relative;
    width: 500%;
    margin: 0;
    left: 0;
    animation: 15s slider infinite;
}
#slider figure img {
    width: 20%;
    float: left;
 }
@keyframes slider {
    0% {
        left:0;
    }
    20% {
        left:0;
    }
    25% {
        left:-100%;
    }
    45% {
        left:-100%;
    }
    50% {
        left:-100%;
    }
    70% {
        left:-200%;
    }
    75% {
        left:-300%;
    }
    95% {
        left:-300%;
    }
    100% {
        left:-400%;
    }
}