This is just a simple tic tac toe game v.s. AI.

Yes, I tried to do this, because I want to learn how to think of an algorithm for AI. Though, the current algorithm of this game is not that good, yet.

For the layout, it was also a good opportunity for me to learn about the CSS property; `display: grid;`.

The time I did this pen, I don't know yet about frameworks, so I only used VanillaJS (A plain Javascript, and without libraries, nor framework).