fix: Motion should provider a basic hidden className

[zombieJ]

resolve #175

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[codecov]

Codecov Report

Merging #176 (28d1e5c) into master (d1ca569) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   99.04%   99.04%           
=======================================
  Files           4        4           
  Lines         105      105           
  Branches       32       32           
=======================================
  Hits          104      104           
  Misses          1        1           

Impacted Files	Coverage Δ
src/Panel.tsx	96.77% <ø> (ø)

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