.slider{
    margin-right: -220px;
}

.slider ul{
    padding: 0;
    display: flex;
    width:100%;
    margin: 0 auto;
    overflow: hidden;
    list-style: none;
}

.slider ul li{
    width: calc(100%/3);
    height: 100%;
    overflow: hidden;
    flex-shrink: 0;
    flex-basis: calc(100%/3);
    transform: scale(1);
}
.slider ul li:first-child {
    margin-left: -33.33333%;
}
.slider ul li img{
    width: 100%;
    overflow: hidden;
    height: 100%;
    object-fit: cover;

    user-drag: none;
    -webkit-user-drag: none;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}