In the Unix world it became common with the introduction of the X Window System.
In the personal computer world it also became common with the launch of Microsoft Windows 1.0 and Apple Macintosh.
Mac was always a tiny fraction of the market. No one used Windows 1.0. High end UNIX workstations were extremely rare.
What was common was DOS, the other home micros, and dumb terminals. All black background.
In the Unix world it became common with the introduction of the X Window System.
In the personal computer world it also became common with the launch of Microsoft Windows 1.0 and Apple Macintosh.