I3: Change window border colour?

@Olsby1 ,
I’m not a regular user of AI, but tested this and it works.

Find the color section: Look for the client.* lines in ~/.config/i3/config, which control the colors for diff to set the focused window border to blue and the unfocused to green, you would edit a line like this:

  client.focused   #0000ff #0000ff #ffffff #0000ff
  client.unfocused #008000 #008000 #ffffff #008000