style: fix popover z-index

[MichaelYuhe]

Fixes: #2234

Fix issue #2205 z-index of the pop-over comoponent should not be smaller than the side bar component.

[vercel]

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[vercel]

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[himself65]

I think this is not a good approach, this file is exported from design side I think.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -21.37 ⚠️

Comparison is base (b036fe8) 69.54% compared to head (5ddd13f) 48.18%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2215       +/-   ##
===========================================
- Coverage   69.54%   48.18%   -21.37%     
===========================================
  Files         310      243       -67     
  Lines        6653     5361     -1292     
  Branches     1096      918      -178     
===========================================
- Hits         4627     2583     -2044     
- Misses       1821     2677      +856     
+ Partials      205      101      -104     

Flag	Coverage Δ
e2etest	?
server-test	73.14% <ø> (ø)
storybook-test	49.77% <ø> (ø)
unittest	35.35% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/theme/src/index.ts	92.30% <ø> (ø)

... and 212 files with indirect coverage changes

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