jamie--- via Mailman-users writes:

I've installed the mailman3, mailman3-full, mailman3-web, and python3-django-mailman3 packages on Debian trixie. Everything is working - thank you developers!

You're welcome.

However, I would like to modify how the web pages look (both postorius and hyperkitty). I noticed that the web interface on this server (lists.mailman3.org) looks much nicer than the one showing on my server. For one, on my installed instance, the left and right margins are not set, so content is flush with the edge of the screen.

Most likely there's a problem accessing the CSS files for Postorius and/or HyperKitty.

What is the easiest/most maintainable way to add my own css code and/or files to adjust how the web interface is displayed? Is that possible?

It is possible (I've done it for some simple changes), but this is a Django question. You probably want to ask on the Django lists if you want to do something more extensive than change some of the text in the pages.

The easiest way in my experience is to find which of the directories on the path to the CSS mailman-web needs doesn't have at least search (o=x) set for both the 'mailman' user and the webserver user (typically 'www-data' on Debian family OSes), and fix that. Look in the error logs for both mailman-web and the webserver for "couldn't access something.css". That's partly a joke, I would think Debian would get this right. But I've run into that twice on systems for security-paranoid clients. Check it, you don't want to write it from scratch since you do like the default style pretty well.

If you get the default styles running, and nevertheless want to do more, Django has search paths for such files that you can add to in 'settings.py'. I recommend adding "/etc/mailman3/whatever" fvo whatever = templates, styles, etc. and putting your substitute files there. Debian won't touch those (except may if you purge the configs?)

Of course you'll have to deal with any changes in parent templates, but this is much more maintainable than changing the distribution templates and styles.

Steve

-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan