const squareWidth = boardElt.offsetWidth / sizeY;
const offset = [boardElt.offsetTop, boardElt.offsetLeft];
const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);
const squareWidth = boardElt.offsetWidth / sizeY;
const offset = [boardElt.offsetTop, boardElt.offsetLeft];
const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);