"The Grid" is a synthwave iTerm colour scheme.

First, get the gist and import it as a color preset under Preferences... > Profiles > Colors.

Then go to Profiles > Text and activate the Blinking cursor.

Then grab the sickest wallpaper you can find from Wallpaper Cave Synthwave Wallpapers and enable it via Profiles > Window. (You may wish to shrink it with Squoosh first.)

Finally, put on some nice music and enjoy the vibe.