XF 2.2 How to only show one line of signature behind a "click to expand" button for multi-line signatures?

Once more... there can be differences between the default styles an how "custom" styles (3rd party) handle certain scenarios.
Of course, at times the !important CSS/LESS designator can be beneficial... as it over-rides some defaults set by the style.
I'm using a child of the default style.
Then you aren't using the default style.... you are using a style you have added (most likely) customizations to. Default style means exactly that.. the default style with NO modifications used. ;)
Try it on the actual default style by entering it in the extra.less template and see if it works. If it does.. then YOUR custom child style has something that changes it.
Ah, I checked my server error logs and another code I had added recently was causing changes to not save.

Well none of the ones in https://xenforo.com/community/threads/scrollable-signatures.8945/ work. But this https://xenforo.com/community/threads/limit-the-signature-display-area.204395/post-1629900 does make them scrollable, but it's not obvious that it's scrollable. So a "click to expand" option would be much better.

I added these lines to hopefully make it more obvious but it didn't do anything:
overflow-y: auto !important;
overflow-x: hidden !important;

I found these two threads but neither has the answer as far as I can tell:
Sometimes CSS/LESS edits simply do not meet the needs.. and you have to have an add-on (or at least template edits)... and sometimes those may be bespoke add-ons that cost a significant amount if you want them only for your site.
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