Display one item and half of the prev/next ones

I'm trying to create an interface like the one shown below:


I tried many ways, but it doesn't work!
So, i find in internet, and see this [issue](https://github.com/kenwheeler/slick/issues/1784)

It say :

```css
.slick-list .slick-track{
padding-left: 12.5%;
}
```

I tried that way, but it doesn't work. Can anyone help me?