[Bug] [docs] the documentation website may have theme color issues at night

[BroKun]

Search before asking

• I had searched in the issues and found no similar issues.

Operating system information

MacOS(M1, M2...)

Python version information

3.10

libro version

No response

What happened

What you expected to happen

fix the style

How to reproduce

Visit the documentation site at night.

Additional context

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[sunshinesmilelk]

Visit the documentation site at night.

I set my computer to dark mode, or to a more time-dependent theme, and even after refreshing the webpage, everything still works fine. The reproduction method is probably not what you mentioned.