Slider UI tweaks (#686)
Slider UI tweaks (#686)

* snap slider
* adjust text position
pranjaltale16/codeworld,pranjaltale16/codeworld,alphalambda/codeworld,google/codeworld,alphalambda/codeworld,pranjaltale16/codeworld,google/codeworld,google/codeworld,alphalambda/codeworld