I really have no idea what this is called and it’s bugging the crap out of me.
I’m trying to use CSS to make a square tile that, when you hover over it, a black box with text slides in from the bottom over that tile. Like if you had a youtube video square, and if you hover over it, a black box slides in with the title or more information.
Can someone point me in the right direction, please?
You mean a tooltip?
Try this: http://csstooltip.com/