Question Where are the primary menu icons stored and can you replace them with your own?

Is it possible to replace the primary menu icons using just the CSS & JSS part of the Control Panel? Any sample CSS/JS would be appreciated.
 

you can. example:

.wt-theme-webtrees .menu-tree .nav-link:before {
    content: url('/public/favicon.ico');
}

address the theme (here .wt-theme-webtrees) and the menu item (here .menu-tree)  and set the image
if you have stored a favicon.ico in your public folder
or
you can use a png-file, ...

---

the "default" icons for theme webtrees are stored within the webtrees.min.css file

Thank you so much, Franz! Worked like a charm. I used png icons. Two small comments for others on you tip and one further question:

(1) Comment 1: Using the "clouds" theme I found the icons with a size of 35 px by 35 px fit in well.

(2) Comment 2: It is important that icon names take upper and lower-case lettering into consideration otherwise the system won't find the icon.

(3) Question: do the icons (or anything else) placed in the /public folder get overwritten when a new webtrees release happens?

for 3) as far as I remember: gets overwritten. to be sure, create your own dir.

> (3) Question: do the icons (or anything else) placed in the /public folder get overwritten when a new webtrees release happens?

The upgrade will write files to the public folder.

It is unlikely that webtrees will create new folders here. I can't rule it out, but it might be necessary.

So just choose a folder name that is unlikely to conflict with anything I might add.

For example, I might add folders with the names of other applications (e.g. ckeditor) or generic things (e.g. "cache", "share", etc.).

So, create a folder containing something else (such as your site name?) and it will be safe here.

Thanks Franz and Greg - indeed, I will create a folder with my website name in /public and deposit the icons there to be on the safe side.