feat: classNames

[MadCcc]

• fix: className should be always on root element
• feat: add classNames

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (07d13ad) 98.31% compared to head (369b98f) 98.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files           7        7           
  Lines         238      238           
  Branches       54       54           
=======================================
  Hits          234      234           
  Misses          4        4           

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