Hi, there is a style bug on the online documentation.
The highlighting don't fill all the line when the codeblock have a scrollbar

Unfortunaly I can't try to fix the CSS I don't have computer for a few more weeks
This is a mobile related issue with markdown_extensions, doesn't belongs to FastAPI
We use hl_lines when adding a highlight to a line
Example:
> ``` Python hl_lines="4 9 10 11 12 25 26 27"
> some_code_here
> ```
It adds highlighting to the whole line so the problem probably belongs to markdown_extensions in mkdocs.yml
Oops my Bad,
I'll open an issue on the mkdocs repo
Thanks for the help here @ycd ! :clap: :bow:
Thanks for reporting back and closing the issue @flapili :+1: