parent {
display: flex;
overflow-x: auto;
overflow-y: hidden;
-ms-flex-wrap: nowrap;
flex-wrap: nowrap;
-webkit-overflow-scrolling: touch;
}
innerElements {
-webkit-box-flex: 0;
-ms-flex: 0 0 66.66667%;
flex: 0 0 66.66667%;
max-width: 66.66667%;
padding-right: 20px;
}
https://kenwheeler.github.io/slick/