docs: improve the docs repl appearance in the light mode

[TrickyPi]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

After changes

But these changes also slightly affected the dark mode.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	Sep 20, 2023 3:18am

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#xiaopi-docs-look

Notice: Ensure you have installed Rust nightly. If you haven't installed it yet, please first see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust, then see https://rust-lang.github.io/rustup/concepts/channels.html to learn how to install Rust nightly.

or load it into the REPL:
https://rollup-fmlr5dj6e-rollup-js.vercel.app/repl/?pr=5145

[codecov]

Codecov Report

Merging #5145 (33d02a6) into master (5950fc8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5145   +/-   ##
=======================================
  Coverage   98.93%   98.93%           
=======================================
  Files         226      226           
  Lines        8444     8444           
  Branches     2319     2319           
=======================================
  Hits         8354     8354           
  Misses         32       32           
  Partials       58       58           

[lukastaegert]

Ah, thanks. I can only suspect these changes crept in via updates in vitepress that I overlooked. Thank you for fixing!

[rollup-bot]

This PR has been released as part of rollup@3.29.3. You can test it via npm install rollup.