I like your layouts -- the boxes space everything out nicely. (Reminds me of a box model
)
There's one bug present apparently and I figured it out just now '____'
Is it that the pieces are shifted to the left one pixel? It's a little bit annoying, but I don't think it hurts the game at all.
As a request, could you make X go first instead of O? I think that's the standard for Tic-Tac-Toe