How to wrap long lines inside of markdown ``` code ``` in hugo-book?

[BrentHuang]

eg.

some very long line; some very long line; some very long line; some very long line; some very long line; some very long line; some very long line; some very long line; some very long line; some very long line; 

Horizontal scroll bars are not required, but text is expected to wrap automatically (e.g., a line of up to 80 characters), which is very important for paper printing.

[alex-shpak]

Hi! By default code block do not wrap text as it uses <pre> tag, you can adjust that with css

.markdown  pre {
  whitespace: auto
}

in assets/_custom.scss