Gnome Terminal CSS

gtk.css

/* ~/.config/gtk-3.0/gtk.css */ 
@define-color bg-grey #222;
@define-color active-grey #333;
@define-color border-grey #555;

TerminalWindow .notebook {
  border: 0;
  padding: 0;
  color: #eee;
  background-color: shade(@active-grey, 1);
}

TerminalWindow .notebook tab:active {
  border: 0;
  padding: 0;
  /*font-size: smaller;*/
  background-color: shade(@active-grey, 1);
}

TerminalWindow .notebook tab {
  border: 0;
  padding: 0;
  /*font-size: smaller;*/
  background-color: shade(@bg-grey, 1);
}

/*
TerminalWindow .notebook .button {
  border: 4;
  padding: 4;
}

TerminalWindow .notebook .toogle {
  border: 0;
  padding: 0;
  background-color: shade(@bg-grey, 1);
}
*/