added inline css position for slice2 element

quick hack for safari on iphone with ios8

before | after
------------ | -------------
![slitslider-before-o](https://cloud.githubusercontent.com/assets/2650264/5194459/9a539fdc-750d-11e4-9c51-8c97758e6a32.png) | ![slitslider-after-o](https://cloud.githubusercontent.com/assets/2650264/5194460/9cfb974e-750d-11e4-84e2-aafd491ccf8c.png)