Imagine #bg is my body, and I want to make the slider (slick slider center center) for every slides. The plugin already has advaptive height but I just coulnd't make it center center on #bg.

<http://fiddle.jshell.net/obd45c4r/>

I tried vertical align trick like 

```
.vcenter {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

```

but it just doesn't help.