feat: Add one more className

[zombieJ]

resolve ant-design/ant-design#30175

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[codecov]

Codecov Report

Merging #142 (47f0781) into master (eeb7bdb) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 47f0781 differs from pull request most recent head b053117. Consider uploading reports for the commit b053117 to get more accurate results

@@            Coverage Diff            @@
##            master      #142   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          471       469    -2     
  Branches        89        89           
=========================================
- Hits           471       469    -2     

Impacted Files	Coverage Δ
src/ScrollBar.tsx	100.00% <100.00%> (ø)

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