main content gets too large when there is a long line in a code block

As seen here: https://ocaml-ppx.github.io/ppxlib/ppxlib/driver.html#:~:text=the%20next%20phase.-,The%20Global%20T[%E2%80%A6]tion%27s%20name.,-The%20Last%20Instrumentation

Either we enable wrapping in code block, or a sub-scrollbar. Horizontal scrolling on the whole is not good.