Great as a web panel (see second screenshot) when "glances -w" is automatically running in your system without running in a terminal (see glances.service at https://github.com/nicolargo/glances/wiki/Start-Glances-through-Systemd).

Note that the code works only when I make the script global in Vivaldi and just set the target URL in Stylish UI, instead of using:

@-moz-document url("http://0.0.0.0:61208/") {
}

But I am a newbie so it is very likely that I am missing something to make it work with that line.