.slider {
    max-width: 1200px;
  width: 100%;
    margin: auto;
    overflow: hidden;
}
.slider ul {
    display: flex;
    padding: 0;
    animation: cambio 40s infinite linear;
}
.slider li {
    padding:0 10px;
    list-style: none;
}
.slider img {
    height: 100px!important;
    width: 200px!important;
    object-fit: contain!important;
  margin: 20px 40px;
}
@keyframes cambio {
    from {margin-left: 0%}
    to {margin-left: -100%}
}