Chess game Update

This is my third update for the chess game. I wanted to add some more functionality to the game with features in more popular chess game engines like Chess.com where it has draw and resign features. I also added a restart game feature since it is single player, but currently there is an issue where the pieces persist at their prior position even though according to the game, they are not there. They button CSS is also not aligned and good compared to the gradient style with the rest of the page, so for the future, I plan on making it one single theme and keeping the page more organized.