chore: update the style of help island in edgeless mode

[JimmFly]

2023-05-05.17.59.52.mov

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	6f0356a
Status:	✅  Deploy successful!
Preview URL:	https://b70b2370.affine.pages.dev
Branch Preview URL:	https://chore-update-help-island-sty.affine.pages.dev

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Name	Status	Preview	Comments	Updated (UTC)
affine-preview	❌ Failed (Inspect)			May 5, 2023 10:03am
affine-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 5, 2023 10:03am

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (fbbcb4b) 70.44% compared to head (6f0356a) 70.47%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2244      +/-   ##
==========================================
+ Coverage   70.44%   70.47%   +0.03%     
==========================================
  Files         308      309       +1     
  Lines        6770     6778       +8     
  Branches     1098     1099       +1     
==========================================
+ Hits         4769     4777       +8     
  Misses       1800     1800              
  Partials      201      201              

Flag	Coverage Δ
e2etest	67.61% <100.00%> (+0.03%)	⬆️
server-test	73.14% <ø> (ø)
storybook-test	55.08% <ø> (+0.23%)	⬆️
unittest	37.28% <ø> (ø)

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

Impacted Files	Coverage Δ
apps/web/src/components/pure/help-island/style.ts	100.00% <ø> (ø)
apps/web/src/components/pure/help-island/index.tsx	85.00% <100.00%> (+0.78%)	⬆️

... and 3 files with indirect coverage changes

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