let chessboard = container.querySelector(".chessboard");
let choices = document.createElement("div");
choices.id = "choices";
let chessboard = container.querySelector(".chessboard");
let choices = document.createElement("div");
choices.id = "choices";
choices.style.width = r.width + "px";
choices.style.height = r.height + "px";
choices.style.left = r.x + "px";
choices.style.width = r.width + "px";
choices.style.height = r.height + "px";
choices.style.left = r.x + "px";