Use ReactiveSearch without default styling applied

**Affected Projects**
React

**Is your feature request related to a problem? Please describe.**
I want to be able to use ReactiveSearch without any base styling applied. I don't want to be overwriting and resetting styles every time i include a new ReactiveSearch component.

**Describe the solution you'd like**
It would be nice to have a version of the library available without any default classes/styling applied.

**Describe alternatives you've considered**
I have tried using the className properties but the original class names and styling remain present on the element.