global_styles.css: reduce min-height to 500px

[jdchristensen]

With 600px, the attached window you get when clicking on the Join extension icon required a scroll bar, making the tab buttons not visible by default. 500px works for me, but I don't know how to choose a value that will work universally.

[joaomgcd]

Thanks for the pull request! What OS and Chrome version are you using?

[jdchristensen]

I'm using Ubuntu 22.04 with Chrome 110.0.5481.177-1. This change helps on one laptop, but not on another with the same OS and Chrome version. In general, I'm having a lot of trouble with the popup (not the popout) showing only part of the content, and requiring one or even two vertical scroll bars to see the rest. (The scroll bars are sometimes nested, which is very awkward.) I also get a horizontal scroll bar in the devices section: the list of commands is too long to fit vertically, so it spills over into a second column. Just to be clear, I'm talking about the transient window that first appears when you click on the Join extension icon, not the detached window that appears if you click on the popout button. Someone who knows css better than me should be able to fix it...