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Demo: http://codepen.io/anon/pen/wCyHv
And another protip is to use the correct css selector #circle when targeting a div with the id circle :P

Or just use adduser (http://manpages.ubuntu.com/manpages/trusty/en/man8/adduser.8.html) and deluser (http://manpages.ubuntu.com/manpages/trusty/en/man8/deluser.8.html).
They are friendlier front ends to the userdel and groupdel programs, removing the home directory as option or even all files on the system owned by the user to be removed, running a custom script, and other features.

I named my servers after planets from Star Wars, they are easy to remember a few of them are only one word, and you find wallpapers to them everywhere :D (Tatooine, Alderaan, Hoth etc..) 100% cool idea! (Even more fun when you setup subdomains and put the wallpaper on the default vhost on the webserver)