Slider follow-up from testing (#176)
* slider follow-up from testing
* add thumbStyle
* pull shared styling out
* use size
* add size to more places
* fix l sizing
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Co-authored-by: Yihui Liao <44729383+yihuiliao@users.noreply.github.com>
Co-authored-by: Kyle Taborski <taborski@adobe.com>
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