Themes: too narrow

Default and Discourse Classic are too narrow for output from lsblk on FreeBSD:

redditish is wider, but still too narrow for output from zpool list -v:

Is it possible to have an adaptation of Default that allows much greater width?

Glancing at and under, I imagine that this is a commonplace issue.

I’m currently browsing for something to widen … if I don’t find something ready-made, I might create a style for myself (although I have very poor knowledge of CSS etc.) …

There’s a Fully theme that’s full-width, however this appears to be not significantly wider for posts within the fullness:

Practical ZFS – more practical, with a slight variation to a style that I found for a different site:

The ALTROOT column heading becomes visible, and so on.