[Vega vis] tweak vega vis tooltip style

[ruanyl]

Description

Before

After

Issues Resolved

Screenshot

Testing the changes

Changelog

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[github-actions]

❌ Empty Changelog Section

The Changelog section in your PR description is empty. Please add a valid changelog entry or entries. If you did add a changelog entry, check to make sure that it was not accidentally included inside the comment block in the Changelog section.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.54%. Comparing base (091d031) to head (7ff96e5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10815   +/-   ##
=======================================
  Coverage   60.54%   60.54%           
=======================================
  Files        4511     4511           
  Lines      121359   121359           
  Branches    20266    20266           
=======================================
+ Hits        73473    73478    +5     
+ Misses      42738    42735    -3     
+ Partials     5148     5146    -2     

Flag	Coverage Δ
Linux_1	26.56% <ø> (ø)
Linux_2	38.82% <ø> (ø)
Linux_3	39.08% <ø> (ø)
Linux_4	33.62% <ø> (ø)
Windows_1	26.57% <ø> (+0.01%)	⬆️
Windows_2	38.79% <ø> (ø)
Windows_3	39.09% <ø> (ø)
Windows_4	33.62% <ø> (?)

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[github-actions]

❌ Empty Changelog Section

The Changelog section in your PR description is empty. Please add a valid changelog entry or entries. If you did add a changelog entry, check to make sure that it was not accidentally included inside the comment block in the Changelog section.