I am talking about the white/gray line in these images.
https://imgur.com/a/5JS2gsf
I want to change the color of it, but can't for the life of me find out what the name is.
EDIT: Found the [answer](https://emacs.stackexchange.com/questions/29873/whats-this-line-between-the-modeline-and-the-echo-area) myself. I just set the window-divider to 0 like this:
(setq window-divider-default-bottom-width 0)
and it went away.