.slider__chico{
    margin-top: 20px;
    width: 70%;
    
    overflow: hidden;
}

.slider__chico ul {
    display: flex;
    padding: 0;
    width: 400%;
    
    animation: cambio 20s infinite alternate;
    animation-timing-function: ease-in;
}

.slider__chico li{
    width: 100%;
    list-style: none;
}

.slider__chico img{
    width: 100%;
}

@keyframes cambio {
    0%{margin-left: 0; }
    20%{margin-left: 0; }
    
    25%{margin-left: -100%; }
    45%{margin-left: -100%; }
    
    50%{margin-left: -200%; }
    75%{margin-left: -200%; }
    
    80%{margin-left: -300%; }
    95%{margin-left: -300%; }
}