Unitless Css Styles should not be converted to string

[rishabhrathod01]

Expected Behaviour

css -> z-index: 1;
js -> zIndex: 1,

Actual Behaviour :-

css -> z-index: 1;
js -> zIndex: '1',

most of the Css-In-Js libraries do not support string unitless values.

Let me know if i need to send a PR to resolve it.

[rishabhrathod01]

#28 Resolves this.